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authorEric Dumazet <edumazet@google.com>2017-08-18 22:08:07 +0300
committerDavid S. Miller <davem@davemloft.net>2017-08-19 01:14:07 +0300
commit9620fef27ed2cdb37bf6fd028f32bea2ef5119a8 (patch)
tree7d4b243d0f353b98fd379d0d6ad800d734506e30 /net/core/dst.c
parent633cefe390e59e9449dc88707235e57ac76b5c38 (diff)
downloadlinux-9620fef27ed2cdb37bf6fd028f32bea2ef5119a8.tar.xz
ipv4: convert dst_metrics.refcnt 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: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/dst.c')
-rw-r--r--net/core/dst.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/net/core/dst.c b/net/core/dst.c
index 00aa972ad1a1..d6ead757c258 100644
--- a/net/core/dst.c
+++ b/net/core/dst.c
@@ -55,7 +55,7 @@ const struct dst_metrics dst_default_metrics = {
* We really want to avoid false sharing on this variable, and catch
* any writes on it.
*/
- .refcnt = ATOMIC_INIT(1),
+ .refcnt = REFCOUNT_INIT(1),
};
void dst_init(struct dst_entry *dst, struct dst_ops *ops,
@@ -213,7 +213,7 @@ u32 *dst_cow_metrics_generic(struct dst_entry *dst, unsigned long old)
struct dst_metrics *old_p = (struct dst_metrics *)__DST_METRICS_PTR(old);
unsigned long prev, new;
- atomic_set(&p->refcnt, 1);
+ refcount_set(&p->refcnt, 1);
memcpy(p->metrics, old_p->metrics, sizeof(p->metrics));
new = (unsigned long) p;
@@ -225,7 +225,7 @@ u32 *dst_cow_metrics_generic(struct dst_entry *dst, unsigned long old)
if (prev & DST_METRICS_READ_ONLY)
p = NULL;
} else if (prev & DST_METRICS_REFCOUNTED) {
- if (atomic_dec_and_test(&old_p->refcnt))
+ if (refcount_dec_and_test(&old_p->refcnt))
kfree(old_p);
}
}