commit d0fa64e2a3e8a0c2302bc5fe7c8145a8ee0ccb97
author Steffen Klassert <steffen.klassert@secunet.com> Fri Aug 25 09:05:42 2017 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> Wed Sep 20 08:22:11 2017 +0200
tree a9db37a941979c2f71e02014d33f515a69ddf4cc
parent 7816eb3874a273dc9461c78cdc3280a2437bc280

ipv6: Fix may be used uninitialized warning in rt6_check

commit 3614364527daa870264f6dde77f02853cdecd02c upstream.

rt_cookie might be used uninitialized, fix this by
initializing it.

Fixes: c5cff8561d2d ("ipv6: add rcu grace period before freeing fib6_node")
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

net/ipv6/route.c

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index b75f79a..9b93b4a 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1290,7 +1290,7 @@ static void rt6_dst_from_metrics_check(struct rt6_info *rt)
 
 static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
 {
-	u32 rt_cookie;
+	u32 rt_cookie = 0;
 
 	if (!rt6_get_cookie_safe(rt, &rt_cookie) || rt_cookie != cookie)
 		return NULL;