From dfee0a725bb027b749ffdd318eb48b91d564b266 Mon Sep 17 00:00:00 2001
From: Olaf Kirch <olaf.kirch@oracle.com>
Date: Fri, 9 Mar 2007 13:55:38 -0800
Subject: [PATCH] [IPV6]: Fix for ipv6_setsockopt NULL dereference

I came across this bug in http://bugzilla.kernel.org/show_bug.cgi?id=8155

Signed-off-by: Olaf Kirch <olaf.kirch@oracle.com>
Acked-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/ipv6/ipv6_sockglue.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 4e0561a082d0..b82333b9228f 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -413,7 +413,7 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 		}
 
 		/* routing header option needs extra check */
-		if (optname == IPV6_RTHDR && opt->srcrt) {
+		if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 			struct ipv6_rt_hdr *rthdr = opt->srcrt;
 			switch (rthdr->type) {
 			case IPV6_SRCRT_TYPE_0:
-- 
2.20.1