target/linux/generic/backport-5.4/080-wireguard-0092-wireguard-receive-remove-dead-code-from-default-pack.patch

   1 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
   2 From: "Jason A. Donenfeld" <Jason@zx2c4.com>
   3 Date: Wed, 18 Mar 2020 18:30:46 -0600
   4 Subject: [PATCH] wireguard: receive: remove dead code from default packet type
   5  case
   6
   7 commit 2b8765c52db24c0fbcc81bac9b5e8390f2c7d3c8 upstream.
   8
   9 The situation in which we wind up hitting the default case here
  10 indicates a major bug in earlier parsing code. It is not a usual thing
  11 that should ever happen, which means a "friendly" message for it doesn't
  12 make sense. Rather, replace this with a WARN_ON, just like we do earlier
  13 in the file for a similar situation, so that somebody sends us a bug
  14 report and we can fix it.
  15
  16 Reported-by: Fabian Freyer <fabianfreyer@radicallyopensecurity.com>
  17 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
  18 Signed-off-by: David S. Miller <davem@davemloft.net>
  19 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
  20 ---
  21  drivers/net/wireguard/receive.c | 3 +--
  22  1 file changed, 1 insertion(+), 2 deletions(-)
  23
  24 --- a/drivers/net/wireguard/receive.c
  25 +++ b/drivers/net/wireguard/receive.c
  26 @@ -587,8 +587,7 @@ void wg_packet_receive(struct wg_device
  27                 wg_packet_consume_data(wg, skb);
  28                 break;
  29         default:
  30 -               net_dbg_skb_ratelimited("%s: Invalid packet from %pISpfsc\n",
  31 -                                       wg->dev->name, skb);
  32 +               WARN(1, "Non-exhaustive parsing of packet header lead to unknown packet type!\n");
  33                 goto err;
  34         }
  35         return;