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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "stable@vger.kernel.org" <stable@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
CC:     Haishuang Yan <yanhaishuang@cmss.chinamobile.com>,
        Alexei Starovoitov <ast@fb.com>,
        "David S . Miller" <davem@davemloft.net>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.9 086/293] ip6_tunnel: fix potential issue in
 __ip6_tnl_rcv
Thread-Topic: [PATCH AUTOSEL for 4.9 086/293] ip6_tunnel: fix potential issue
 in __ip6_tnl_rcv
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Date:   Mon, 9 Apr 2018 00:24:01 +0000
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From: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>

[ Upstream commit f1925ca50deb48eddafc01bc12c2a17bfbf54425 ]

When __ip6_tnl_rcv fails, the tun_dst won't be freed, so call
dst_release to free it in error code path.

Fixes: 8d79266bc48c ("ip6_tunnel: add collect_md mode to IPv6 tunnels")
CC: Alexei Starovoitov <ast@fb.com>
Tested-by: Zhang Shengju <zhangshengju@cmss.chinamobile.com>
Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 net/ipv6/ip6_tunnel.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index a2fcf7bdb597..5a009807ac2f 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -859,6 +859,8 @@ static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct=
 sk_buff *skb,
 	return 0;
=20
 drop:
+	if (tun_dst)
+		dst_release((struct dst_entry *)tun_dst);
 	kfree_skb(skb);
 	return 0;
 }
--=20
2.15.1