tun: orphan frags on xmit

tun xmit is actually receive of the internal tun
socket. Orphan the frags same as we do for normal rx path.
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/tun.c

@@ -416,6 +416,8 @@ static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
 
 	/* Orphan the skb - required as we might hang on to it
 	 * for indefinite time. */
+	if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC)))
+		goto drop;
 	skb_orphan(skb);
 
 	/* Enqueue packet */