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@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
mariux64 · Mar 9, 2018 · e41c7c6 · e41c7c6
1 parent d6aa711
commit e41c7c6
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
@@ -903,6 +903,9 @@ 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;