[PATCH 3.16 227/306] neigh: check error pointer instead of NULL for ipv4_neigh_lookup()

Ben Hutchings
2017-02-16T00:13:48Z

From: WANG Cong <xiyou.wangcong@gmail.com>

commit 2c1a4311b61072afe2309d4152a7993e92caa41c upstream.

Fixes: commit f187bc6efb7250afee0e2009b6106 ("ipv4: No need to set generic neighbour pointer")
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
net/ipv4/route.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -747,7 +747,7 @@ static void __ip_do_redirect(struct rtab
}

n = ipv4_neigh_lookup(&rt->dst, NULL, &new_gw);
- if (n) {
+ if (!IS_ERR(n)) {
if (!(n->nud_state & NUD_VALID)) {
neigh_event_send(n, NULL);
} else {