From 7829684088a216b8b53894768cd4f483c246cb94 Mon Sep 17 00:00:00 2001
From: Steffen Klassert <steffen.klassert@secunet.com>
Date: Fri, 25 Aug 2017 09:05:42 +0200
Subject: 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 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 9c2dd3f77cdb..61729641e027 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1267,7 +1267,7 @@ 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;
-- 
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