netdev - [PATCH net-next] net: ipv4: Fix NULL pointer dereference in route lookup

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Message-ID: <20190301133810.8107-1-idosch@mellanox.com>
Date:   Fri, 1 Mar 2019 13:38:43 +0000
From:   Ido Schimmel <idosch@...lanox.com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "dsahern@...il.com" <dsahern@...il.com>,
        mlxsw <mlxsw@...lanox.com>, Ido Schimmel <idosch@...lanox.com>,
        wenxu <wenxu@...oud.cn>
Subject: [PATCH net-next] net: ipv4: Fix NULL pointer dereference in route
 lookup

When calculating the multipath hash for input routes the flow info is
not available and therefore should not be used.

Fixes: 24ba14406c5c ("route: Add multipath_hash in flowi_common to make user-define hash")
Signed-off-by: Ido Schimmel <idosch@...lanox.com>
Cc: wenxu <wenxu@...oud.cn>
---
 net/ipv4/route.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 7cf4c8305071..e3ac458b5d8b 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1820,7 +1820,7 @@ static void ip_multipath_l3_keys(const struct sk_buff *skb,
 int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4,
 		       const struct sk_buff *skb, struct flow_keys *flkeys)
 {
-	u32 multipath_hash = fl4->flowi4_multipath_hash;
+	u32 multipath_hash = fl4 ? fl4->flowi4_multipath_hash : 0;
 	struct flow_keys hash_keys;
 	u32 mhash;
 
-- 
2.20.1