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Date:	Sun, 29 Sep 2013 05:15:35 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	netdev@...r.kernel.org
Subject: [PATCH] ipv6: sit: ensure prefixlen <= 128 before calling ipv6_addr_prefix

Found with coverity: CID 139492

Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
---
 net/ipv6/sit.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 7ee5cb9..4011178 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -1004,6 +1004,9 @@ static int ipip6_tunnel_update_6rd(struct ip_tunnel *t,
 	    ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64)
 		return -EINVAL;
 
+	if (ip6rd->prefixlen > 128)
+		return -EINVAL;
+
 	ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen);
 	if (!ipv6_addr_equal(&prefix, &ip6rd->prefix))
 		return -EINVAL;
-- 
1.8.3.1

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