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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>
CC:     Haishuang Yan <yanhaishuang@cmss.chinamobile.com>,
        William Tu <u9012063@gmail.com>,
        "David S . Miller" <davem@davemloft.net>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.14 54/67] ip_gre: fix error path when erspan_rcv
 failed
Thread-Topic: [PATCH AUTOSEL for 4.14 54/67] ip_gre: fix error path when
 erspan_rcv failed
Thread-Index: AQHTtpoFriZbuBrTPUSsS9TW3Xhhpg==
Date:   Thu, 8 Mar 2018 04:57:55 +0000
Message-ID: <20180308045641.7814-54-alexander.levin@microsoft.com>
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From: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>

[ Upstream commit dd8d5b8c5b22e31079b259b8bfb686f1fac1080a ]

When erspan_rcv call return PACKET_REJECT, we shoudn't call ipgre_rcv to
process packets again, instead send icmp unreachable message in error
path.

Fixes: 84e54fe0a5ea ("gre: introduce native tunnel support for ERSPAN")
Acked-by: William Tu <u9012063@gmail.com>
Cc: William Tu <u9012063@gmail.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/ipv4/ip_gre.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 045331204097..e0cc6a38b701 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -408,11 +408,13 @@ static int gre_rcv(struct sk_buff *skb)
 	if (unlikely(tpi.proto =3D=3D htons(ETH_P_ERSPAN))) {
 		if (erspan_rcv(skb, &tpi, hdr_len) =3D=3D PACKET_RCVD)
 			return 0;
+		goto out;
 	}
=20
 	if (ipgre_rcv(skb, &tpi, hdr_len) =3D=3D PACKET_RCVD)
 		return 0;
=20
+out:
 	icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
 drop:
 	kfree_skb(skb);
--=20
2.14.1