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

[William Tu]

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 <u9012...@gmail.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