• David Howells's avatar
    KEYS: Fix an RCU warning in the reading of user keys · d9a9b4ae
    David Howells authored
    
    
    Fix an RCU warning in the reading of user keys:
    
    ===================================================
    [ INFO: suspicious rcu_dereference_check() usage. ]
    ---------------------------------------------------
    security/keys/user_defined.c:202 invoked rcu_dereference_check() without protection!
    
    other info that might help us debug this:
    
    rcu_scheduler_active = 1, debug_locks = 0
    1 lock held by keyctl/3637:
     #0:  (&key->sem){+++++.}, at: [<ffffffff811a80ae>] keyctl_read_key+0x9c/0xcf
    
    stack backtrace:
    Pid: 3637, comm: keyctl Not tainted 2.6.34-rc5-cachefs #18
    Call Trace:
     [<ffffffff81051f6c>] lockdep_rcu_dereference+0xaa/0xb2
     [<ffffffff811aa55f>] user_read+0x47/0x91
     [<ffffffff811a80be>] keyctl_read_key+0xac/0xcf
     [<ffffffff811a8a06>] sys_keyctl+0x75/0xb7
     [<ffffffff81001eeb>] system_call_fastpath+0x16/0x1b
    Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
    Acked-by: default avatarSerge Hallyn <serue@us.ibm.com>
    Signed-off-by: default avatarJames Morris <jmorris@namei.org>
    d9a9b4ae