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net: add debug atomic_inc_not_zero() in dst_hold()

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This patch is meant to add a debug warning on the situation where dst is
being held during its destroy phase. This could potentially cause double
free issue on the dst.

Signed-off-by: Wei Wang <[email protected]>
Acked-by: Martin KaFai Lau <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Wei Wang authored and David S. Miller committed 2017-06-17 22:54:01 -04:00
1 parent 1eb04e7c9e
commit 44ebe79149
1 file changed
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include/net/dst.h
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@@ -251,7 +251,7 @@ static inline void dst_hold(struct dst_entry *dst)
* __pad_to_align_refcnt declaration in struct dst_entry
*/
BUILD_BUG_ON(offsetof(struct dst_entry, __refcnt) & 63);
atomic_inc(&dst->__refcnt);
WARN_ON(atomic_inc_not_zero(&dst->__refcnt) == 0);
}
static inline void dst_use(struct dst_entry *dst, unsigned long time)