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net: print proper warning on dst underflow 

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)