Commit af420749 authored by Reshetova, Elena's avatar Reshetova, Elena Committed by David S. Miller
Browse files

net, netrom: convert nr_neigh.refcount from atomic_t to refcount_t



refcount_t type and corresponding API should be
used instead of atomic_t when the variable is used as
a reference counter. This allows to avoid accidental
refcounter overflows that might lead to use-after-free
situations.
Signed-off-by: default avatarElena Reshetova <elena.reshetova@intel.com>
Signed-off-by: default avatarHans Liljestrand <ishkamiel@gmail.com>
Signed-off-by: default avatarKees Cook <keescook@chromium.org>
Signed-off-by: default avatarDavid Windsor <dwindsor@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 16f73c96
......@@ -11,6 +11,7 @@
#include <linux/list.h>
#include <linux/slab.h>
#include <net/sock.h>
#include <linux/refcount.h>
#define NR_NETWORK_LEN 15
#define NR_TRANSPORT_LEN 5
......@@ -93,7 +94,7 @@ struct nr_neigh {
unsigned short count;
unsigned int number;
unsigned char failed;
atomic_t refcount;
refcount_t refcount;
};
struct nr_route {
......@@ -128,11 +129,11 @@ static __inline__ void nr_node_put(struct nr_node *nr_node)
}
#define nr_neigh_hold(__nr_neigh) \
atomic_inc(&((__nr_neigh)->refcount))
refcount_inc(&((__nr_neigh)->refcount))
static __inline__ void nr_neigh_put(struct nr_neigh *nr_neigh)
{
if (atomic_dec_and_test(&nr_neigh->refcount)) {
if (refcount_dec_and_test(&nr_neigh->refcount)) {
if (nr_neigh->ax25)
ax25_cb_put(nr_neigh->ax25);
kfree(nr_neigh->digipeat);
......
......@@ -149,7 +149,7 @@ static int __must_check nr_add_node(ax25_address *nr, const char *mnemonic,
nr_neigh->count = 0;
nr_neigh->number = nr_neigh_no++;
nr_neigh->failed = 0;
atomic_set(&nr_neigh->refcount, 1);
refcount_set(&nr_neigh->refcount, 1);
if (ax25_digi != NULL && ax25_digi->ndigi > 0) {
nr_neigh->digipeat = kmemdup(ax25_digi,
......@@ -431,7 +431,7 @@ static int __must_check nr_add_neigh(ax25_address *callsign,
nr_neigh->count = 0;
nr_neigh->number = nr_neigh_no++;
nr_neigh->failed = 0;
atomic_set(&nr_neigh->refcount, 1);
refcount_set(&nr_neigh->refcount, 1);
if (ax25_digi != NULL && ax25_digi->ndigi > 0) {
nr_neigh->digipeat = kmemdup(ax25_digi, sizeof(*ax25_digi),
......
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