netdev - [PATCH net 2/3] ip6erspan: improve error handling for erspan version number.

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Message-Id: <1520609682-101077-3-git-send-email-u9012063@gmail.com>
Date:   Fri,  9 Mar 2018 07:34:41 -0800
From:   William Tu <u9012063@...il.com>
To:     netdev@...r.kernel.org
Subject: [PATCH net 2/3] ip6erspan: improve error handling for erspan version number.

When users fill in incorrect erspan version number through
the struct erspan_metadata uapi, current code skips pushing
the erspan header but continue pushing the gre header, which
is incorrect.  The patch fixes it by returning error.

Signed-off-by: William Tu <u9012063@...il.com>
---
 net/ipv6/ip6_gre.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
index a056c2bb4b9a..4ab476d3a46e 100644
--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -948,6 +948,8 @@ static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
 					       md->u.md2.dir,
 					       get_hwid(&md->u.md2),
 					       truncate, false);
+		} else {
+			goto tx_err;
 		}
 	} else {
 		switch (skb->protocol) {
-- 
2.7.4