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Subject[ 42/48] ipv4: fix nexthop attlen check in fib_nh_match
2.6.32-longterm review patch.  If anyone has any objections, please let me know.

------------------

From: Jiri Pirko <jiri@resnulli.us>

commit f76936d07c4eeb36d8dbb64ebd30ab46ff85d9f7 upstream.

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@resnulli.us>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
(cherry picked from commit 0aba46add2915b344580569e87d9c41274b9c475)

Signed-off-by: Willy Tarreau <w@1wt.eu>
---
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 9b096d6..8fc396a 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -453,7 +453,7 @@ 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);
--
1.7.12.2.21.g234cd45.dirty




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