linux-kernel - [PATCH 3/6] afs: Fix use of BUG()

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Date:   Tue, 09 Jun 2020 17:13:26 +0100
From:   David Howells <dhowells@...hat.com>
To:     linux-afs@...ts.infradead.org
Cc:     Kees Cook <keescook@...omium.org>, dhowells@...hat.com,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/6] afs: Fix use of BUG()

Fix afs_compare_addrs() to use WARN_ON(1) instead of BUG() and return 1
(ie. srx_a > srx_b).

There's no point trying to put actual error handling in as this should not
occur unless a new transport address type is allowed by AFS.  And even if
it does, in this particular case, it'll just never match unknown types of
addresses.  This BUG() was more of a 'you need to add a case here'
indicator.

Reported-by: Kees Cook <keescook@...omium.org>
Signed-off-by: David Howells <dhowells@...hat.com>
---

 fs/afs/vl_alias.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/afs/vl_alias.c b/fs/afs/vl_alias.c
index 093895c49c21..136fc6164e00 100644
--- a/fs/afs/vl_alias.c
+++ b/fs/afs/vl_alias.c
@@ -73,7 +73,8 @@ static int afs_compare_addrs(const struct sockaddr_rxrpc *srx_a,
 	}

 	default:
-		BUG();
+		WARN_ON(1);
+		diff = 1;
 	}

 out: