1. 03 Feb, 2015 8 commits
    • NeilBrown's avatar
      md: make ->congested robust against personality changes. · 5c675f83
      NeilBrown authored
      
      
      There is currently no locking around calls to the 'congested'
      bdi function.  If called at an awkward time while an array is
      being converted from one level (or personality) to another, there
      is a tiny chance of running code in an unreferenced module etc.
      
      So add a 'congested' function to the md_personality operations
      structure, and call it with appropriate locking from a central
      'mddev_congested'.
      
      When the array personality is changing the array will be 'suspended'
      so no IO is processed.
      If mddev_congested detects this, it simply reports that the
      array is congested, which is a safe guess.
      As mddev_suspend calls synchronize_rcu(), mddev_congested can
      avoid races by included the whole call inside an rcu_read_lock()
      region.
      This require that the congested functions for all subordinate devices
      can be run under rcu_lock.  Fortunately this is the case.
      
      Signed-off-by: default avatarNeilBrown <neilb@suse.de>
      5c675f83
    • NeilBrown's avatar
      md: rename mddev->write_lock to mddev->lock · 85572d7c
      NeilBrown authored
      
      
      This lock is used for (slightly) more than helping with writing
      superblocks, and it will soon be extended further.  So the
      name is inappropriate.
      
      Also, the _irq variant hasn't been needed since 2.6.37 as it is
      never taking from interrupt or bh context.
      
      So:
        -rename write_lock to lock
        -document what it protects
        -remove _irq ... except in md_flush_request() as there
           is no wait_event_lock() (with no _irq).  This can be
           cleaned up after appropriate changes to wait.h.
      
      Signed-off-by: default avatarNeilBrown <neilb@suse.de>
      85572d7c
    • NeilBrown's avatar
      md/raid5: need_this_block: tidy/fix last condition. · ea664c82
      NeilBrown authored
      
      
      That last condition is unclear and over cautious.
      
      There are two related issues here.
      
      If a partial write is destined for a missing device, then
      either RMW or RCW can work.  We must read all the available
      block.  Only then can the missing blocks be calculated, and
      then the parity update performed.
      
      If RMW is not an option, then there is a complication even
      without partial writes.  If we would need to read a missing
      device to perform the reconstruction, then we must first read every
      block so the missing device data can be computed.
      This is the case for RAID6 (Which currently does not support
      RMW) and for times when we don't trust the parity (after a crash)
      and so are in the process of resyncing it.
      
      So make these two cases more clear and separate, and perform
      the relevant tests more  thoroughly.
      
      Signed-off-by: default avatarNeilBrown <neilb@suse.de>
      ea664c82
    • NeilBrown's avatar
      md/raid5: need_this_block: start simplifying the last two conditions. · a9d56950
      NeilBrown authored
      
      
      Both the last two cases are only relevant if something has failed and
      something needs to be written (but not over-written), and if it is OK
      to pre-read blocks at this point.  So factor out those tests and
      explain them.
      
      Signed-off-by: default avatarNeilBrown <neilb@suse.de>
      a9d56950
    • NeilBrown's avatar
      md/raid5: separate out the easy conditions in need_this_block. · a79cfe12
      NeilBrown authored
      
      
      Some of the conditions in need_this_block have very straight
      forward motivation.  Separate those out and document them.
      
      Signed-off-by: default avatarNeilBrown <neilb@suse.de>
      a79cfe12
    • NeilBrown's avatar
      md/raid5: separate large if clause out of fetch_block(). · 2c58f06e
      NeilBrown authored
      
      
      fetch_block() has a very large and hard to read 'if' condition.
      
      Separate it into its own function so that it can be
      made more readable.
      
      Signed-off-by: default avatarNeilBrown <neilb@suse.de>
      2c58f06e
    • Jes Sorensen's avatar
      md: do_release_stripe(): No need to call md_wakeup_thread() twice · ad3ab8b6
      Jes Sorensen authored
      67f45548
      
       introduced a call to
      md_wakeup_thread() when adding to the delayed_list. However the md
      thread is woken up unconditionally just below.
      
      Remove the unnecessary wakeup call.
      
      Signed-off-by: default avatarJes Sorensen <Jes.Sorensen@redhat.com>
      Signed-off-by: default avatarNeilBrown <neilb@suse.de>
      ad3ab8b6
    • Jan Beulich's avatar
      x86/raid6: correctly check for assembler capabilities · 75aaf4c3
      Jan Beulich authored
      
      
      Just like for AVX2 (which simply needs an #if -> #ifdef conversion),
      SSSE3 assembler support should be checked for before using it.
      
      Signed-off-by: default avatarJan Beulich <jbeulich@suse.com>
      Cc: Jim Kukunas <james.t.kukunas@linux.intel.com>
      Acked-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarNeilBrown <neilb@suse.de>
      75aaf4c3
  2. 02 Feb, 2015 2 commits
  3. 27 Jan, 2015 30 commits
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net · 59343cd7
      Linus Torvalds authored
      Pull networking fixes from David Miller:
      
       1) Don't OOPS on socket AIO, from Christoph Hellwig.
      
       2) Scheduled scans should be aborted upon RFKILL, from Emmanuel
          Grumbach.
      
       3) Fix sleep in atomic context in kvaser_usb, from Ahmed S Darwish.
      
       4) Fix RCU locking across copy_to_user() in bpf code, from Alexei
          Starovoitov.
      
       5) Lots of crash, memory leak, short TX packet et al bug fixes in
          sh_eth from Ben Hutchings.
      
       6) Fix memory corruption in SCTP wrt.  INIT collitions, from Daniel
          Borkmann.
      
       7) Fix return value logic for poll handlers in netxen, enic, and bnx2x.
          From Eric Dumazet and Govindarajulu Varadarajan.
      
       8) Header length calculation fix in mac80211 from Fred Chou.
      
       9) mv643xx_eth doesn't handle highmem correctly in non-TSO code paths.
          From Ezequiel Garcia.
      
      10) udp_diag has bogus logic in it's hash chain skipping, copy same fix
          tcp diag used.  From Herbert Xu.
      
      11) amd-xgbe programs wrong rx flow control register, from Thomas
          Lendacky.
      
      12) Fix race leading to use after free in ping receive path, from Subash
          Abhinov Kasiviswanathan.
      
      13) Cache redirect routes otherwise we can get a heavy backlog of rcu
          jobs liberating DST_NOCACHE entries.  From Hannes Frederic Sowa.
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (48 commits)
        net: don't OOPS on socket aio
        stmmac: prevent probe drivers to crash kernel
        bnx2x: fix napi poll return value for repoll
        ipv6: replacing a rt6_info needs to purge possible propagated rt6_infos too
        sh_eth: Fix DMA-API usage for RX buffers
        sh_eth: Check for DMA mapping errors on transmit
        sh_eth: Ensure DMA engines are stopped before freeing buffers
        sh_eth: Remove RX overflow log messages
        ping: Fix race in free in receive path
        udp_diag: Fix socket skipping within chain
        can: kvaser_usb: Fix state handling upon BUS_ERROR events
        can: kvaser_usb: Retry the first bulk transfer on -ETIMEDOUT
        can: kvaser_usb: Send correct context to URB completion
        can: kvaser_usb: Do not sleep in atomic context
        ipv4: try to cache dst_entries which would cause a redirect
        samples: bpf: relax test_maps check
        bpf: rcu lock must not be held when calling copy_to_user()
        net: sctp: fix slab corruption from use after free on INIT collisions
        net: mv643xx_eth: Fix highmem support in non-TSO egress path
        sh_eth: Fix serialisation of interrupt disable with interrupt & NAPI handlers
        ...
      59343cd7
    • Christoph Hellwig's avatar
      net: don't OOPS on socket aio · 06539d30
      Christoph Hellwig authored
      
      
      Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      06539d30
    • Andy Shevchenko's avatar
      stmmac: prevent probe drivers to crash kernel · 9afec6ef
      Andy Shevchenko authored
      
      
      In the case when alloc_netdev fails we return NULL to a caller. But there is no
      check for NULL in the probe drivers. This patch changes NULL to an error
      pointer. The function description is amended to reflect what we may get
      returned.
      
      Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      9afec6ef
    • Linus Torvalds's avatar
      Merge tag 'powerpc-3.19-5' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux · 7da323bb
      Linus Torvalds authored
      Pull powerpc fixes from Michael Ellerman:
       "Two powerpc fixes"
      
      * tag 'powerpc-3.19-5' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux:
        powerpc/powernv: Restore LPCR with LPCR_PECE1 cleared
        powerpc/xmon: Fix another endiannes issue in RTAS call from xmon
      7da323bb
    • Linus Torvalds's avatar
      Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux · 41592e2f
      Linus Torvalds authored
      Pull one more module fix from Rusty Russell:
       "SCSI was using module_refcount() to figure out when the module was
        unloading: this broke with new atomic refcounting.  The code is still
        suspicious, but this solves the WARN_ON()"
      
      * tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux:
        scsi: always increment reference count
      41592e2f
    • Govindarajulu Varadarajan's avatar
      bnx2x: fix napi poll return value for repoll · 24e579c8
      Govindarajulu Varadarajan authored
      With the commit d75b1ade
      
       ("net: less interrupt masking in NAPI") napi
      repoll is done only when work_done == budget. When in busy_poll is we return 0
      in napi_poll. We should return budget.
      
      Signed-off-by: default avatarGovindarajulu Varadarajan <_govind@gmx.com>
      Acked-by: default avatarEric Dumazet <edumazet@google.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      24e579c8
    • David S. Miller's avatar
      Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec · bf693f7b
      David S. Miller authored
      
      
      Steffen Klassert says:
      
      ====================
      ipsec 2015-01-26
      
      Just two small fixes for _decode_session6() where we
      might decode to wrong header information in some rare
      situations.
      
      Please pull or let me know if there are problems.
      ====================
      
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      bf693f7b
    • Hannes Frederic Sowa's avatar
      ipv6: replacing a rt6_info needs to purge possible propagated rt6_infos too · 6e9e16e6
      Hannes Frederic Sowa authored
      Lubomir Rintel reported that during replacing a route the interface
      reference counter isn't correctly decremented.
      
      To quote bug <https://bugzilla.kernel.org/show_bug.cgi?id=91941>:
      | [root@rhel7-5 lkundrak]# sh -x lal
      | + ip link add dev0 type dummy
      | + ip link set dev0 up
      | + ip link add dev1 type dummy
      | + ip link set dev1 up
      | + ip addr add 2001:db8:8086::2/64 dev dev0
      | + ip route add 2001:db8:8086::/48 dev dev0 proto static metric 20
      | + ip route add 2001:db8:8088::/48 dev dev1 proto static metric 10
      | + ip route replace 2001:db8:8086::/48 dev dev1 proto static metric 20
      | + ip link del dev0 type dummy
      | Message from syslogd@rhel7-5 at Jan 23 10:54:41 ...
      |  kernel:unregister_netdevice: waiting for dev0 to become free. Usage count = 2
      |
      | Message from syslogd@rhel7-5 at Jan 23 10:54:51 ...
      |  kernel:unregister_netdevice: waiting for dev0 to become free. Usage count = 2
      
      During replacement of a rt6_info we must walk all parent nodes and check
      if the to be replaced rt6_info got propagated. If so, replace it with
      an alive one.
      
      Fixes: 4a287eba
      
       ("IPv6 routing, NLM_F_* flag support: REPLACE and EXCL flags support, warn about missing CREATE flag")
      Reported-by: default avatarLubomir Rintel <lkundrak@v3.sk>
      Signed-off-by: default avatarHannes Frederic Sowa <hannes@stressinduktion.org>
      Tested-by: default avatarLubomir Rintel <lkundrak@v3.sk>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      6e9e16e6
    • David S. Miller's avatar
      Merge branch 'sh_eth' · 22577609
      David S. Miller authored
      
      
      Ben Hutchings says:
      
      ====================
      Fixes for sh_eth #3
      
      I'm continuing review and testing of Ethernet support on the R-Car H2
      chip.  This series fixes the last of the more serious issues I've found.
      
      These are not tested on any of the other supported chips.
      ====================
      
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      22577609
    • Ben Hutchings's avatar
      sh_eth: Fix DMA-API usage for RX buffers · 52b9fa36
      Ben Hutchings authored
      
      
      - Use the return value of dma_map_single(), rather than calling
        virt_to_page() separately
      - Check for mapping failue
      - Call dma_unmap_single() rather than dma_sync_single_for_cpu()
      
      Signed-off-by: default avatarBen Hutchings <ben.hutchings@codethink.co.uk>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      52b9fa36
    • Ben Hutchings's avatar
      sh_eth: Check for DMA mapping errors on transmit · aa3933b8
      Ben Hutchings authored
      
      
      dma_map_single() may fail if an IOMMU or swiotlb is in use, so
      we need to check for this.
      
      Signed-off-by: default avatarBen Hutchings <ben.hutchings@codethink.co.uk>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      aa3933b8
    • Ben Hutchings's avatar
      sh_eth: Ensure DMA engines are stopped before freeing buffers · 740c7f31
      Ben Hutchings authored
      
      
      Currently we try to clear EDRRR and EDTRR and immediately continue to
      free buffers.  This is unsafe because:
      
      - In general, register writes are not serialised with DMA, so we still
        have to wait for DMA to complete somehow
      - The R8A7790 (R-Car H2) manual states that the TX running flag cannot
        be cleared by writing to EDTRR
      - The same manual states that clearing the RX running flag only stops
        RX DMA at the next packet boundary
      
      I applied this patch to the driver to detect DMA writes to freed
      buffers:
      
      > --- a/drivers/net/ethernet/renesas/sh_eth.c
      > +++ b/drivers/net/ethernet/renesas/sh_eth.c
      > @@ -1098,7 +1098,14 @@ static void sh_eth_ring_free(struct net_device *ndev)
      >  	/* Free Rx skb ringbuffer */
      >  	if (mdp->rx_skbuff) {
      >  		for (i = 0; i < mdp->num_rx_ring; i++)
      > +			memcpy(mdp->rx_skbuff[i]->data,
      > +			       "Hello, world", 12);
      > +		msleep(100);
      > +		for (i = 0; i < mdp->num_rx_ring; i++) {
      > +			WARN_ON(memcmp(mdp->rx_skbuff[i]->data,
      > +				       "Hello, world", 12));
      >  			dev_kfree_skb(mdp->rx_skbuff[i]);
      > +		}
      >  	}
      >  	kfree(mdp->rx_skbuff);
      >  	mdp->rx_skbuff = NULL;
      
      then ran the loop:
      
          while ethtool -G eth0 rx 128 ; ethtool -G eth0 rx 64; do echo -n .; done
      
      and 'ping -f' toward the sh_eth port from another machine.  The
      warning fired several times a minute.
      
      To fix these issues:
      
      - Deactivate all TX descriptors rather than writing to EDTRR
      - As there seems to be no way of telling when RX DMA is stopped,
        perform a soft reset to ensure that both DMA enginess are stopped
      - To reduce the possibility of the reset truncating a transmitted
        frame, disable egress and wait a reasonable time to reach a
        packet boundary before resetting
      - Update statistics before resetting
      
      (The 'reasonable time' does not allow for CS/CD in half-duplex
      mode, but half-duplex no longer seems reasonable!)
      
      Signed-off-by: default avatarBen Hutchings <ben.hutchings@codethink.co.uk>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      740c7f31
    • Ben Hutchings's avatar
      sh_eth: Remove RX overflow log messages · dc1d0e6d
      Ben Hutchings authored
      
      
      If RX traffic is overflowing the FIFO or DMA ring, logging every time
      this happens just makes things worse.  These errors are visible in the
      statistics anyway.
      
      Signed-off-by: default avatarBen Hutchings <ben.hutchings@codethink.co.uk>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      dc1d0e6d
    • David S. Miller's avatar
      Merge tag 'linux-can-fixes-for-3.19-20150127' of... · 8d8d67f1
      David S. Miller authored
      Merge tag 'linux-can-fixes-for-3.19-20150127' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can
      
      
      
      Marc Kleine-Budde says:
      
      ====================
      pull-request: can 2015-01-27
      
      this is another pull request for net/master which consists of 4 patches.
      
      All 4 patches are contributed by Ahmed S. Darwish, he fixes more problems in
      the kvaser_usb driver.
      
      David, please merge net/master to net-next/master, as we have more kvaser_usb
      patches in the queue, that target net-next.
      ====================
      
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      8d8d67f1
    • subashab@codeaurora.org's avatar
      ping: Fix race in free in receive path · fc752f1f
      subashab@codeaurora.org authored
      
      
      An exception is seen in ICMP ping receive path where the skb
      destructor sock_rfree() tries to access a freed socket. This happens
      because ping_rcv() releases socket reference with sock_put() and this
      internally frees up the socket. Later icmp_rcv() will try to free the
      skb and as part of this, skb destructor is called and which leads
      to a kernel panic as the socket is freed already in ping_rcv().
      
      -->|exception
      -007|sk_mem_uncharge
      -007|sock_rfree
      -008|skb_release_head_state
      -009|skb_release_all
      -009|__kfree_skb
      -010|kfree_skb
      -011|icmp_rcv
      -012|ip_local_deliver_finish
      
      Fix this incorrect free by cloning this skb and processing this cloned
      skb instead.
      
      This patch was suggested by Eric Dumazet
      
      Signed-off-by: default avatarSubash Abhinov Kasiviswanathan <subashab@codeaurora.org>
      Cc: Eric Dumazet <edumazet@google.com>
      Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      fc752f1f
    • Herbert Xu's avatar
      udp_diag: Fix socket skipping within chain · 86f3cddb
      Herbert Xu authored
      
      
      While working on rhashtable walking I noticed that the UDP diag
      dumping code is buggy.  In particular, the socket skipping within
      a chain never happens, even though we record the number of sockets
      that should be skipped.
      
      As this code was supposedly copied from TCP, this patch does what
      TCP does and resets num before we walk a chain.
      
      Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
      Acked-by: default avatarPavel Emelyanov <xemul@parallels.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      86f3cddb
    • Ahmed S. Darwish's avatar
      can: kvaser_usb: Fix state handling upon BUS_ERROR events · e638642b
      Ahmed S. Darwish authored
      
      
      While being in an ERROR_WARNING state, and receiving further
      bus error events with error counters still in the ERROR_WARNING
      range of 97-127 inclusive, the state handling code erroneously
      reverts back to ERROR_ACTIVE.
      
      Per the CAN standard, only revert to ERROR_ACTIVE when the
      error counters are less than 96.
      
      Moreover, in certain Kvaser models, the BUS_ERROR flag is
      always set along with undefined bits in the M16C status
      register. Thus use bitwise operators instead of full equality
      for checking that register against bus errors.
      
      Signed-off-by: default avatarAhmed S. Darwish <ahmed.darwish@valeo.com>
      Cc: linux-stable <stable@vger.kernel.org>
      Signed-off-by: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
      e638642b
    • Ahmed S. Darwish's avatar
      can: kvaser_usb: Retry the first bulk transfer on -ETIMEDOUT · 14c10c2a
      Ahmed S. Darwish authored
      
      
      On some x86 laptops, plugging a Kvaser device again after an
      unplug makes the firmware always ignore the very first command.
      For such a case, provide some room for retries instead of
      completely exiting the driver init code.
      
      Signed-off-by: default avatarAhmed S. Darwish <ahmed.darwish@valeo.com>
      Cc: linux-stable <stable@vger.kernel.org>
      Signed-off-by: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
      14c10c2a
    • Ahmed S. Darwish's avatar
      can: kvaser_usb: Send correct context to URB completion · 3803fa69
      Ahmed S. Darwish authored
      
      
      Send expected argument to the URB completion hander: a CAN
      netdevice instead of the network interface private context
      `kvaser_usb_net_priv'.
      
      This was discovered by having some garbage in the kernel
      log in place of the netdevice names: can0 and can1.
      
      Signed-off-by: default avatarAhmed S. Darwish <ahmed.darwish@valeo.com>
      Cc: linux-stable <stable@vger.kernel.org>
      Signed-off-by: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
      3803fa69
    • Ahmed S. Darwish's avatar
      can: kvaser_usb: Do not sleep in atomic context · ded50066
      Ahmed S. Darwish authored
      Upon receiving a hardware event with the BUS_RESET flag set,
      the driver kills all of its anchored URBs and resets all of
      its transmit URB contexts.
      
      Unfortunately it does so under the context of URB completion
      handler `kvaser_usb_read_bulk_callback()', which is often
      called in an atomic context.
      
      While the device is flooded with many received error packets,
      usb_kill_urb() typically sleeps/reschedules till the transfer
      request of each killed URB in question completes, leading to
      the sleep in atomic bug. [3]
      
      In v2 submission of the original driver patch [1], it was
      stated that the URBs kill and tx contexts reset was needed
      since we don't receive any tx acknowledgments later and thus
      such resources will be locked down forever. Fortunately this
      is no longer needed since an earlier bugfix in this patch
      series is now applied: all tx URB contexts are reset upon CAN
      channel close. [2]
      
      Moreover, a BUS_RESET is now treated _exactly_ like a BUS_OFF
      event, which is the recommended handling method advised by
      the device manufacturer.
      
      [1] http://article.gmane.org/gmane.linux.network/239442
          http://www.webcitation.org/6Vr2yagAQ
      
      [2] can: kvaser_usb: Reset all URB tx contexts upon channel close
          889b77f7
      
      
      
      [3] Stacktrace:
      
       <IRQ>  [<ffffffff8158de87>] dump_stack+0x45/0x57
       [<ffffffff8158b60c>] __schedule_bug+0x41/0x4f
       [<ffffffff815904b1>] __schedule+0x5f1/0x700
       [<ffffffff8159360a>] ? _raw_spin_unlock_irqrestore+0xa/0x10
       [<ffffffff81590684>] schedule+0x24/0x70
       [<ffffffff8147d0a5>] usb_kill_urb+0x65/0xa0
       [<ffffffff81077970>] ? prepare_to_wait_event+0x110/0x110
       [<ffffffff8147d7d8>] usb_kill_anchored_urbs+0x48/0x80
       [<ffffffffa01f4028>] kvaser_usb_unlink_tx_urbs+0x18/0x50 [kvaser_usb]
       [<ffffffffa01f45d0>] kvaser_usb_rx_error+0xc0/0x400 [kvaser_usb]
       [<ffffffff8108b14a>] ? vprintk_default+0x1a/0x20
       [<ffffffffa01f5241>] kvaser_usb_read_bulk_callback+0x4c1/0x5f0 [kvaser_usb]
       [<ffffffff8147a73e>] __usb_hcd_giveback_urb+0x5e/0xc0
       [<ffffffff8147a8a1>] usb_hcd_giveback_urb+0x41/0x110
       [<ffffffffa0008748>] finish_urb+0x98/0x180 [ohci_hcd]
       [<ffffffff810cd1a7>] ? acct_account_cputime+0x17/0x20
       [<ffffffff81069f65>] ? local_clock+0x15/0x30
       [<ffffffffa000a36b>] ohci_work+0x1fb/0x5a0 [ohci_hcd]
       [<ffffffff814fbb31>] ? process_backlog+0xb1/0x130
       [<ffffffffa000cd5b>] ohci_irq+0xeb/0x270 [ohci_hcd]
       [<ffffffff81479fc1>] usb_hcd_irq+0x21/0x30
       [<ffffffff8108bfd3>] handle_irq_event_percpu+0x43/0x120
       [<ffffffff8108c0ed>] handle_irq_event+0x3d/0x60
       [<ffffffff8108ec84>] handle_fasteoi_irq+0x74/0x110
       [<ffffffff81004dfd>] handle_irq+0x1d/0x30
       [<ffffffff81004727>] do_IRQ+0x57/0x100
       [<ffffffff8159482a>] common_interrupt+0x6a/0x6a
      
      Signed-off-by: default avatarAhmed S. Darwish <ahmed.darwish@valeo.com>
      Cc: linux-stable <stable@vger.kernel.org>
      Signed-off-by: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
      ded50066
    • David S. Miller's avatar
      Merge tag 'mac80211-for-davem-2015-01-23' of... · 7d63585b
      David S. Miller authored
      Merge tag 'mac80211-for-davem-2015-01-23' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211
      
      
      
      Another set of last-minute fixes:
       * fix station double-removal when suspending while associating
       * fix the HT (802.11n) header length calculation
       * fix the CCK radiotap flag used for monitoring, a pretty
         old regression but a simple one-liner
       * fix per-station group-key handling
      
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      7d63585b
    • Hannes Frederic Sowa's avatar
      ipv4: try to cache dst_entries which would cause a redirect · df4d9254
      Hannes Frederic Sowa authored
      Not caching dst_entries which cause redirects could be exploited by hosts
      on the same subnet, causing a severe DoS attack. This effect aggravated
      since commit f8864972
      
       ("ipv4: fix dst race in sk_dst_get()").
      
      Lookups causing redirects will be allocated with DST_NOCACHE set which
      will force dst_release to free them via RCU.  Unfortunately waiting for
      RCU grace period just takes too long, we can end up with >1M dst_entries
      waiting to be released and the system will run OOM. rcuos threads cannot
      catch up under high softirq load.
      
      Attaching the flag to emit a redirect later on to the specific skb allows
      us to cache those dst_entries thus reducing the pressure on allocation
      and deallocation.
      
      This issue was discovered by Marcelo Leitner.
      
      Cc: Julian Anastasov <ja@ssi.bg>
      Signed-off-by: default avatarMarcelo Leitner <mleitner@redhat.com>
      Signed-off-by: default avatarFlorian Westphal <fw@strlen.de>
      Signed-off-by: default avatarHannes Frederic Sowa <hannes@stressinduktion.org>
      Signed-off-by: default avatarJulian Anastasov <ja@ssi.bg>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      df4d9254
    • David S. Miller's avatar
      Merge branch 'bpf' · 412d2907
      David S. Miller authored
      
      
      Alexei Starovoitov says:
      
      ====================
      bpf: fix two bugs
      
      Michael Holzheu caught two issues (in bpf syscall and in the test).
      Fix them. Details in corresponding patches.
      ====================
      
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      412d2907
    • Alexei Starovoitov's avatar
      samples: bpf: relax test_maps check · ba1a68bf
      Alexei Starovoitov authored
      hash map is unordered, so get_next_key() iterator shouldn't
      rely on particular order of elements. So relax this test.
      
      Fixes: ffb65f27
      
       ("bpf: add a testsuite for eBPF maps")
      Reported-by: default avatarMichael Holzheu <holzheu@linux.vnet.ibm.com>
      Signed-off-by: default avatarAlexei Starovoitov <ast@plumgrid.com>
      Acked-by: default avatarDaniel Borkmann <dborkman@redhat.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      ba1a68bf
    • Alexei Starovoitov's avatar
      bpf: rcu lock must not be held when calling copy_to_user() · 8ebe667c
      Alexei Starovoitov authored
      BUG: sleeping function called from invalid context at mm/memory.c:3732
      in_atomic(): 0, irqs_disabled(): 0, pid: 671, name: test_maps
      1 lock held by test_maps/671:
       #0:  (rcu_read_lock){......}, at: [<0000000000264190>] map_lookup_elem+0xe8/0x260
      Call Trace:
      ([<0000000000115b7e>] show_trace+0x12e/0x150)
       [<0000000000115c40>] show_stack+0xa0/0x100
       [<00000000009b163c>] dump_stack+0x74/0xc8
       [<000000000017424a>] ___might_sleep+0x23a/0x248
       [<00000000002b58e8>] might_fault+0x70/0xe8
       [<0000000000264230>] map_lookup_elem+0x188/0x260
       [<0000000000264716>] SyS_bpf+0x20e/0x840
      
      Fix it by allocating temporary buffer to store map element value.
      
      Fixes: db20fd2b
      
       ("bpf: add lookup/update/delete/iterate methods to BPF maps")
      Reported-by: default avatarMichael Holzheu <holzheu@linux.vnet.ibm.com>
      Signed-off-by: default avatarAlexei Starovoitov <ast@plumgrid.com>
      Acked-by: default avatarDaniel Borkmann <dborkman@redhat.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      8ebe667c
    • Daniel Borkmann's avatar
      net: sctp: fix slab corruption from use after free on INIT collisions · 600ddd68
      Daniel Borkmann authored
      When hitting an INIT collision case during the 4WHS with AUTH enabled, as
      already described in detail in commit 1be9a950 ("net: sctp: inherit
      auth_capable on INIT collisions"), it can happen that we occasionally
      still remotely trigger the following panic on server side which seems to
      have been uncovered after the fix from commit 1be9a950 ...
      
      [  533.876389] BUG: unable to handle kernel paging request at 00000000ffffffff
      [  533.913657] IP: [<ffffffff811ac385>] __kmalloc+0x95/0x230
      [  533.940559] PGD 5030f2067 PUD 0
      [  533.957104] Oops: 0000 [#1] SMP
      [  533.974283] Modules linked in: sctp mlx4_en [...]
      [  534.939704] Call Trace:
      [  534.951833]  [<ffffffff81294e30>] ? crypto_init_shash_ops+0x60/0xf0
      [  534.984213]  [<ffffffff81294e30>] crypto_init_shash_ops+0x60/0xf0
      [  535.015025]  [<ffffffff8128c8ed>] __crypto_alloc_tfm+0x6d/0x170
      [  535.045661]  [<ffffffff8128d12c>] crypto_alloc_base+0x4c/0xb0
      [  535.074593]  [<ffffffff8160bd42>] ? _raw_spin_lock_bh+0x12/0x50
      [  535.105239]  [<ffffffffa0418c11>] sctp_inet_listen+0x161/0x1e0 [sctp]
      [  535.138606]  [<ffffffff814e43bd>] SyS_listen+0x9d/0xb0
      [  535.166848]  [<ffffffff816149a9>] system_call_fastpath+0x16/0x1b
      
      ... or depending on the the application, for example this one:
      
      [ 1370.026490] BUG: unable to handle kernel paging request at 00000000ffffffff
      [ 1370.026506] IP: [<ffffffff811ab455>] kmem_cache_alloc+0x75/0x1d0
      [ 1370.054568] PGD 633c94067 PUD 0
      [ 1370.070446] Oops: 0000 [#1] SMP
      [ 1370.085010] Modules linked in: sctp kvm_amd kvm [...]
      [ 1370.963431] Call Trace:
      [ 1370.974632]  [<ffffffff8120f7cf>] ? SyS_epoll_ctl+0x53f/0x960
      [ 1371.000863]  [<ffffffff8120f7cf>] SyS_epoll_ctl+0x53f/0x960
      [ 1371.027154]  [<ffffffff812100d3>] ? anon_inode_getfile+0xd3/0x170
      [ 1371.054679]  [<ffffffff811e3d67>] ? __alloc_fd+0xa7/0x130
      [ 1371.080183]  [<ffffffff816149a9>] system_call_fastpath+0x16/0x1b
      
      With slab debugging enabled, we can see that the poison has been overwritten:
      
      [  669.826368] BUG kmalloc-128 (Tainted: G        W     ): Poison overwritten
      [  669.826385] INFO: 0xffff880228b32e50-0xffff880228b32e50. First byte 0x6a instead of 0x6b
      [  669.826414] INFO: Allocated in sctp_auth_create_key+0x23/0x50 [sctp] age=3 cpu=0 pid=18494
      [  669.826424]  __slab_alloc+0x4bf/0x566
      [  669.826433]  __kmalloc+0x280/0x310
      [  669.826453]  sctp_auth_create_key+0x23/0x50 [sctp]
      [  669.826471]  sctp_auth_asoc_create_secret+0xcb/0x1e0 [sctp]
      [  669.826488]  sctp_auth_asoc_init_active_key+0x68/0xa0 [sctp]
      [  669.826505]  sctp_do_sm+0x29d/0x17c0 [sctp] [...]
      [  669.826629] INFO: Freed in kzfree+0x31/0x40 age=1 cpu=0 pid=18494
      [  669.826635]  __slab_free+0x39/0x2a8
      [  669.826643]  kfree+0x1d6/0x230
      [  669.826650]  kzfree+0x31/0x40
      [  669.826666]  sctp_auth_key_put+0x19/0x20 [sctp]
      [  669.826681]  sctp_assoc_update+0x1ee/0x2d0 [sctp]
      [  669.826695]  sctp_do_sm+0x674/0x17c0 [sctp]
      
      Since this only triggers in some collision-cases with AUTH, the problem at
      heart is that sctp_auth_key_put() on asoc->asoc_shared_key is called twice
      when having refcnt 1, once directly in sctp_assoc_update() and yet again
      from within sctp_auth_asoc_init_active_key() via sctp_assoc_update() on
      the already kzfree'd memory, which is also consistent with the observation
      of the poison decrease from 0x6b to 0x6a (note: the overwrite is detected
      at a later point in time when poison is checked on new allocation).
      
      Reference counting of auth keys revisited:
      
      Shared keys for AUTH chunks are being stored in endpoints and associations
      in endpoint_shared_keys list. On endpoint creation, a null key is being
      added; on association creation, all endpoint shared keys are being cached
      and thus cloned over to the association. struct sctp_shared_key only holds
      a pointer to the actual key bytes, that is, struct sctp_auth_bytes which
      keeps track of users internally through refcounting. Naturally, on assoc
      or enpoint destruction, sctp_shared_key are being destroyed directly and
      the reference on sctp_auth_bytes dropped.
      
      User space can add keys to either list via setsockopt(2) through struct
      sctp_authkey and by passing that to sctp_auth_set_key() which replaces or
      adds a new auth key. There, sctp_auth_create_key() creates a new sctp_auth_bytes
      with refcount 1 and in case of replacement drops the reference on the old
      sctp_auth_bytes. A key can be set active from user space through setsockopt()
      on the id via sctp_auth_set_active_key(), which iterates through either
      endpoint_shared_keys and in case of an assoc, invokes (one of various places)
      sctp_auth_asoc_init_active_key().
      
      sctp_auth_asoc_init_active_key() computes the actual secret from local's
      and peer's random, hmac and shared key parameters and returns a new key
      directly as sctp_auth_bytes, that is asoc->asoc_shared_key, plus drops
      the reference if there was a previous one. The secret, which where we
      eventually double drop the ref comes from sctp_auth_asoc_set_secret() with
      intitial refcount of 1, which also stays unchanged eventually in
      sctp_assoc_update(). This key is later being used for crypto layer to
      set the key for the hash in crypto_hash_setkey() from sctp_auth_calculate_hmac().
      
      To close the loop: asoc->asoc_shared_key is freshly allocated secret
      material and independant of the sctp_shared_key management keeping track
      of only shared keys in endpoints and assocs. Hence, also commit 4184b2a7
      ("net: sctp: fix memory leak in auth key management") is independant of
      this bug here since it concerns a different layer (though same structures
      being used eventually). asoc->asoc_shared_key is reference dropped correctly
      on assoc destruction in sctp_association_free() and when active keys are
      being replaced in sctp_auth_asoc_init_active_key(), it always has a refcount
      of 1. Hence, it's freed prematurely in sctp_assoc_update(). Simple fix is
      to remove that sctp_auth_key_put() from there which fixes these panics.
      
      Fixes: 730fc3d0
      
       ("[SCTP]: Implete SCTP-AUTH parameter processing")
      Signed-off-by: default avatarDaniel Borkmann <dborkman@redhat.com>
      Acked-by: default avatarVlad Yasevich <vyasevich@gmail.com>
      Acked-by: default avatarNeil Horman <nhorman@tuxdriver.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      600ddd68
    • Linus Torvalds's avatar
      Merge branch 'akpm' (patches from Andrew Morton) · 4adca1cb
      Linus Torvalds authored
      Merge misc fixes from Andrew Morton:
       "Six fixes"
      
      * emailed patches from Andrew Morton <akpm@linux-foundation.org>:
        drivers/rtc/rtc-s5m.c: terminate s5m_rtc_id array with empty element
        printk: add dummy routine for when CONFIG_PRINTK=n
        mm/vmscan: fix highidx argument type
        memcg: remove extra newlines from memcg oom kill log
        x86, build: replace Perl script with Shell script
        mm: page_alloc: embed OOM killing naturally into allocation slowpath
      4adca1cb
    • Ezequiel Garcia's avatar
      net: mv643xx_eth: Fix highmem support in non-TSO egress path · 9e911414
      Ezequiel Garcia authored
      Commit 69ad0dd7
      Author: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
      Date:   Mon May 19 13:59:59 2014 -0300
      
          net: mv643xx_eth: Use dma_map_single() to map the skb fragments
      
      caused a nasty regression by removing the support for highmem skb
      fragments. By using page_address() to get the address of a fragment's
      page, we are assuming a lowmem page. However, such assumption is incorrect,
      as fragments can be in highmem pages, resulting in very nasty issues.
      
      This commit fixes this by using the skb_frag_dma_map() helper,
      which takes care of mapping the skb fragment properly. Additionally,
      the type of mapping is now tracked, so it can be unmapped using
      dma_unmap_page or dma_unmap_single when appropriate.
      
      This commit also fixes the error path in txq_init() to release the
      resources properly.
      
      Fixes: 69ad0dd7
      
       ("net: mv643xx_eth: Use dma_map_single() to map the skb fragments")
      Reported-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
      Signed-off-by: default avatarEzequiel Garcia <ezequiel.garcia@free-electrons.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      9e911414
    • David S. Miller's avatar
      Merge branch 'sh_eth' · 9d08da96
      David S. Miller authored
      
      
      Ben Hutchings says:
      
      ====================
      Fixes for sh_eth #2
      
      I'm continuing review and testing of Ethernet support on the R-Car H2
      chip.  This series fixes more of the issues I've found, but it won't be
      the last set.
      
      These are not tested on any of the other supported chips.
      ====================
      
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      9d08da96
    • Ben Hutchings's avatar
      sh_eth: Fix serialisation of interrupt disable with interrupt & NAPI handlers · 283e38db
      Ben Hutchings authored
      
      
      In order to stop the RX path accessing the RX ring while it's being
      stopped or resized, we clear the interrupt mask (EESIPR) and then call
      free_irq() or synchronise_irq().  This is insufficient because the
      interrupt handler or NAPI poller may set EESIPR again after we clear
      it.  Also, in sh_eth_set_ringparam() we currently don't disable NAPI
      polling at all.
      
      I could easily trigger a crash by running the loop:
      
         while ethtool -G eth0 rx 128 && ethtool -G eth0 rx 64; do echo -n .; done
      
      and 'ping -f' toward the sh_eth port from another machine.
      
      To fix this:
      - Add a software flag (irq_enabled) to signal whether interrupts
        should be enabled
      - In the interrupt handler, if the flag is clear then clear EESIPR
        and return
      - In the NAPI poller, if the flag is clear then don't set EESIPR
      - Set the flag before enabling interrupts in sh_eth_dev_init() and
        sh_eth_set_ringparam()
      - Clear the flag and serialise with the interrupt and NAPI
        handlers before clearing EESIPR in sh_eth_close() and
        sh_eth_set_ringparam()
      
      After this, I could run the loop for 100,000 iterations successfully.
      
      Signed-off-by: default avatarBen Hutchings <ben.hutchings@codethink.co.uk>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      283e38db