netdev - [PATCH net 3/3] ip6erspan: make sure enough headroom at xmit.

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Message-Id: <1520609682-101077-4-git-send-email-u9012063@gmail.com>
Date:   Fri,  9 Mar 2018 07:34:42 -0800
From:   William Tu <u9012063@...il.com>
To:     netdev@...r.kernel.org
Subject: [PATCH net 3/3] ip6erspan: make sure enough headroom at xmit.

The patch adds skb_cow_header() to ensure enough headroom
at ip6erspan_tunnel_xmit before pushing the erspan header
to the skb.

Signed-off-by: William Tu <u9012063@...il.com>
---
 net/ipv6/ip6_gre.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
index 4ab476d3a46e..9a759bbbd8a6 100644
--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -906,6 +906,9 @@ static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
 		truncate = true;
 	}

+	if (skb_cow_head(skb, dev->needed_headroom))
+		goto tx_err;
+
 	t->parms.o_flags &= ~TUNNEL_KEY;
 	IPCB(skb)->flags = 0;

-- 
2.7.4