[PATCH net-next 21/21] net: add debug atomic_inc_not_zero() in dst_hold()
flat view
STALE3414d
SUPERSEDED: 1 (0M)
From: Wei Wang <hidden>
Date: 2017-06-16 17:48:54
Subsystem:
networking [general], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Revision v1 of 2 in this series; 1 review trailer.
Revisions (2)
- v1 current
- v2 [diff vs current]
From: Wei Wang <redacted> 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 <redacted> Acked-by: Martin KaFai Lau <redacted> --- include/net/dst.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/net/dst.h b/include/net/dst.h
index d912b44d2dcb..f73611ec4017 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h@@ -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)
--
2.13.1.518.g3df882009-goog