UPSTREAM: wireguard: socket: mark skbs as not on list when receiving via gro

Certain drivers will pass gro skbs to udp, at which point the udp driver
simply iterates through them and passes them off to encap_rcv, which is
where we pick up. At the moment, we're not attempting to coalesce these
into bundles, but we also don't want to wind up having cascaded lists of
skbs treated separately. The right behavior here, then, is to just mark
each incoming one as not on a list. This can be seen in practice, for
example, with Qualcomm's rmnet_perf driver.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Tested-by: Yaroslav Furman <yaro330@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 736775d06b)
Bug: 152722841
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Icee93ca63e947dc93838bd40f8b51751c417f0f6

drivers/net/wireguard/socket.c

@@ -333,6 +333,7 @@ static int wg_receive(struct sock *sk, struct sk_buff *skb)
 	wg = sk->sk_user_data;
 	if (unlikely(!wg))
 		goto err;
+	skb_mark_not_on_list(skb);
 	wg_packet_receive(wg, skb);
 	return 0;