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

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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: Elena Reshetova <[email protected]>
Signed-off-by: Hans Liljestrand <[email protected]>
Signed-off-by: Kees Cook <[email protected]>
Signed-off-by: David Windsor <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Reshetova, Elena authored and David S. Miller committed 2017-07-04 22:35:17 +01:00
1 parent 16f73c9649
commit af4207494d
2 files changed
+6 -5
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include/net/netrom.h
+4 -3
View File
@@ -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);
net/netrom/nr_route.c
+2 -2
View File
@@ -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),