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ip: fix error handling in ip_finish_output2()

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__neigh_create() returns either a pointer to struct neighbour or PTR_ERR().
But the caller expects it to return either a pointer or NULL.  Replace
the NULL check with IS_ERR() check.

The bug was introduced in a263b30936
("ipv4: Make neigh lookups directly in output packet path.").

Signed-off-by: Vasily Kulikov <segoon@openwall.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vasiliy Kulikov 2012-08-06 03:55:29 +00:00 committed by David S. Miller
parent 91d27a8650
commit 9871f1ad67
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/ip_output.c
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@ -197,7 +197,7 @@ static inline int ip_finish_output2(struct sk_buff *skb)
neigh = __ipv4_neigh_lookup_noref(dev, nexthop);
if (unlikely(!neigh))
neigh = __neigh_create(&arp_tbl, &nexthop, dev, false);
if (neigh) {
if (!IS_ERR(neigh)) {
int res = dst_neigh_output(dst, neigh, skb);
rcu_read_unlock_bh();