From 825e288ef4c55a379a97e104c825eb9b74874099 Mon Sep 17 00:00:00 2001
From: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Date: Wed, 23 Aug 2006 17:21:29 -0700
Subject: [PATCH] [IPV6] ROUTE: Make sure we do not exceed args in
 fib6_lookup_1().

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Acked-by: Ville Nuorvala <vnuorval@tcs.hut.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/ipv6/ip6_fib.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 5408b64f3b5f..19ee7375daa9 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -829,6 +829,9 @@ static struct fib6_node * fib6_lookup_1(struct fib6_node *root,
 	struct fib6_node *fn;
 	int dir;
 
+	if (unlikely(args->offset == 0))
+		return NULL;
+
 	/*
 	 *	Descend on a tree
 	 */
@@ -879,16 +882,22 @@ static struct fib6_node * fib6_lookup_1(struct fib6_node *root,
 struct fib6_node * fib6_lookup(struct fib6_node *root, struct in6_addr *daddr,
 			       struct in6_addr *saddr)
 {
-	struct lookup_args args[2];
 	struct fib6_node *fn;
-
-	args[0].offset = offsetof(struct rt6_info, rt6i_dst);
-	args[0].addr = daddr;
-
+	struct lookup_args args[] = {
+		{
+			.offset = offsetof(struct rt6_info, rt6i_dst),
+			.addr = daddr,
+		},
 #ifdef CONFIG_IPV6_SUBTREES
-	args[1].offset = offsetof(struct rt6_info, rt6i_src);
-	args[1].addr = saddr;
+		{
+			.offset = offsetof(struct rt6_info, rt6i_src),
+			.addr = saddr,
+		},
 #endif
+		{
+			.offset = 0,	/* sentinel */
+		}
+	};
 
 	fn = fib6_lookup_1(root, args);