linux-kernel - [PATCH 3.12 007/206] ipv4: fix nexthop attlen check in fib_nh

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Message-Id: <bc9b1233fe48f27c2325de5ccc584c4b2a0ce12c.1416319692.git.jslaby@suse.cz>
Date:	Tue, 18 Nov 2014 15:06:02 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Jiri Pirko <jiri@...nulli.us>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.12 007/206] ipv4: fix nexthop attlen check in fib_nh_match

From: Jiri Pirko <jiri@...nulli.us>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

[ Upstream commit f76936d07c4eeb36d8dbb64ebd30ab46ff85d9f7 ]

fib_nh_match does not match nexthops correctly. Example:

ip route add 172.16.10/24 nexthop via 192.168.122.12 dev eth0 \
                          nexthop via 192.168.122.13 dev eth0
ip route del 172.16.10/24 nexthop via 192.168.122.14 dev eth0 \
                          nexthop via 192.168.122.15 dev eth0

Del command is successful and route is removed. After this patch
applied, the route is correctly matched and result is:
RTNETLINK answers: No such process

Please consider this for stable trees as well.

Fixes: 4e902c57417c4 ("[IPv4]: FIB configuration using struct fib_config")
Signed-off-by: Jiri Pirko <jiri@...nulli.us>
Acked-by: Eric Dumazet <edumazet@...gle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
---
 net/ipv4/fib_semantics.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index 9f1014ab86c6..ec12b169931b 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -534,7 +534,7 @@ int fib_nh_match(struct fib_config *cfg, struct fib_info *fi)
 			return 1;
 
 		attrlen = rtnh_attrlen(rtnh);
-		if (attrlen < 0) {
+		if (attrlen > 0) {
 			struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
 
 			nla = nla_find(attrs, attrlen, RTA_GATEWAY);
-- 
2.1.3

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