ip6erspan: make sure enough headroom at xmit.

Upstream commit: commit e41c7c68ea771683cae5a7f81c268f38d7912ecb Author: William Tu <[email protected]> Date: Fri Mar 9 07:34:42 2018 -0800 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 <[email protected]> Signed-off-by: David S. Miller <[email protected]> Cc: William Tu <[email protected]> Signed-off-by: Greg Rose <[email protected]> Signed-off-by: Ben Pfaff <[email protected]> Acked-by: William Tu <[email protected]>
lynn901 · May 22, 2018 · bf66270 · bf66270
1 parent 8dc47fb
commit bf66270
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/datapath/linux/compat/ip6_gre.c b/datapath/linux/compat/ip6_gre.c
@@ -1094,6 +1094,9 @@ static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
 	    (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
 		truncate = true;
 
+	if (skb_cow_head(skb, dev->needed_headroom))
+		goto tx_err;
+
 	t->parms.o_flags &= ~TUNNEL_KEY;
 	IPCB(skb)->flags = 0;