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ipv4: convert dst_metrics.refcnt 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: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2017-08-18 12:08:07 -07:00
committed by David S. Miller
parent 633cefe390
commit 9620fef27e
4 changed files with 9 additions and 8 deletions
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3
include/net/dst.h
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@ -14,6 +14,7 @@
#include <linux/rcupdate.h>
#include <linux/bug.h>
#include <linux/jiffies.h>
#include <linux/refcount.h>
#include <net/neighbour.h>
#include <asm/processor.h>
@ -107,7 +108,7 @@ struct dst_entry {
struct dst_metrics {
u32 metrics[RTAX_MAX];
atomic_t refcnt;
refcount_t refcnt;
};
extern const struct dst_metrics dst_default_metrics;