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net: print proper warning on dst underflow

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Proper warnings with stack traces make it much easier to figure out
what's doing the double free and create more meaningful bug reports from
users.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason A. Donenfeld 2019-09-24 11:09:37 +02:00 committed by David S. Miller
parent 3e8b9bfa11
commit adecda5bee
1 changed files with 2 additions and 2 deletions
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4
net/core/dst.c
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@ -172,7 +172,7 @@ void dst_release(struct dst_entry *dst)
int newrefcnt; int newrefcnt;
newrefcnt = atomic_dec_return(&dst->__refcnt); newrefcnt = atomic_dec_return(&dst->__refcnt);
if (unlikely(newrefcnt < 0)) if (WARN_ONCE(newrefcnt < 0, "dst_release underflow"))
net_warn_ratelimited("%s: dst:%p refcnt:%d\n", net_warn_ratelimited("%s: dst:%p refcnt:%d\n",
__func__, dst, newrefcnt); __func__, dst, newrefcnt);
if (!newrefcnt) if (!newrefcnt)
@ -187,7 +187,7 @@ void dst_release_immediate(struct dst_entry *dst)
int newrefcnt; int newrefcnt;
newrefcnt = atomic_dec_return(&dst->__refcnt); newrefcnt = atomic_dec_return(&dst->__refcnt);
if (unlikely(newrefcnt < 0)) if (WARN_ONCE(newrefcnt < 0, "dst_release_immediate underflow"))
net_warn_ratelimited("%s: dst:%p refcnt:%d\n", net_warn_ratelimited("%s: dst:%p refcnt:%d\n",
__func__, dst, newrefcnt); __func__, dst, newrefcnt);
if (!newrefcnt) if (!newrefcnt)