ip6erspan: make sure enough headroom at xmit.

williamtu · davem330 · commit 8dc7079dca7d · 2018-03-09T13:03:57.000-05:00
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 &lt;u9012063@gmail.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
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;
 

Original file line number	Diff line number	Diff line change
`@@ -903,6 +903,9 @@ static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,`
`903`	`903`	`truncate = true;`
`904`	`904`	`}`
`905`	`905`
	`906`	`+ if (skb_cow_head(skb, dev->needed_headroom))`
	`907`	`+ goto tx_err;`
	`908`	`+`
`906`	`909`	`t->parms.o_flags &= ~TUNNEL_KEY;`
`907`	`910`	`IPCB(skb)->flags = 0;`
`908`	`911`