From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Wed, 18 Mar 2020 18:30:46 -0600
Subject: wireguard: receive: remove dead code from default packet type case
Patch-mainline: v5.6
Git-commit: 2b8765c52db24c0fbcc81bac9b5e8390f2c7d3c8
References: bsc#1169021 jsc#SLE-12250

The situation in which we wind up hitting the default case here
indicates a major bug in earlier parsing code. It is not a usual thing
that should ever happen, which means a "friendly" message for it doesn't
make sense. Rather, replace this with a WARN_ON, just like we do earlier
in the file for a similar situation, so that somebody sends us a bug
report and we can fix it.

Reported-by: Fabian Freyer <fabianfreyer@radicallyopensecurity.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Nicolai Stange <nstange@suse.de>
---
 drivers/net/wireguard/receive.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/net/wireguard/receive.c
+++ b/drivers/net/wireguard/receive.c
@@ -587,8 +587,7 @@ void wg_packet_receive(struct wg_device
 		wg_packet_consume_data(wg, skb);
 		break;
 	default:
-		net_dbg_skb_ratelimited("%s: Invalid packet from %pISpfsc\n",
-					wg->dev->name, skb);
+		WARN(1, "Non-exhaustive parsing of packet header lead to unknown packet type!\n");
 		goto err;
 	}
 	return;