netdev - [PATCH net] net: sched: act_tunnel_key: fix NULL pointer dereference during init

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Message-Id: <20190225152827.8741-1-vladbu@mellanox.com>
Date:   Mon, 25 Feb 2019 17:28:27 +0200
From:   Vlad Buslov <vladbu@...lanox.com>
To:     netdev@...r.kernel.org, dcaratti@...hat.com
Cc:     jhs@...atatu.com, xiyou.wangcong@...il.com, jiri@...nulli.us,
        davem@...emloft.net, wenxu@...oud.cn, roid@...lanox.com,
        Vlad Buslov <vladbu@...lanox.com>
Subject: [PATCH net] net: sched: act_tunnel_key: fix NULL pointer dereference during init

Metadata pointer is only initialized for action TCA_TUNNEL_KEY_ACT_SET, but
it is unconditionally dereferenced in tunnel_key_init() error handler.
Verify that metadata pointer is not NULL before dereferencing it in
tunnel_key_init error handling code.

Fixes: ee28bb56ac5b ("net/sched: fix memory leak in act_tunnel_key_init()")
Signed-off-by: Vlad Buslov <vladbu@...lanox.com>
---
 net/sched/act_tunnel_key.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/sched/act_tunnel_key.c b/net/sched/act_tunnel_key.c
index 8b43fe0130f7..3f943de9a2c9 100644
--- a/net/sched/act_tunnel_key.c
+++ b/net/sched/act_tunnel_key.c
@@ -377,7 +377,8 @@ static int tunnel_key_init(struct net *net, struct nlattr *nla,
 	return ret;
 
 release_tun_meta:
-	dst_release(&metadata->dst);
+	if (metadata)
+		dst_release(&metadata->dst);
 
 err_out:
 	if (exists)
-- 
2.13.6