linux-kernel - [PATCH 5.8 100/124] rxrpc: Downgrade the BUG() for unsupported token type in rxrpc

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Date:   Mon, 12 Oct 2020 15:31:44 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, David Howells <dhowells@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.8 100/124] rxrpc: Downgrade the BUG() for unsupported token type in rxrpc_read()

From: David Howells <dhowells@...hat.com>

[ Upstream commit 9a059cd5ca7d9c5c4ca5a6e755cf72f230176b6a ]

If rxrpc_read() (which allows KEYCTL_READ to read a key), sees a token of a
type it doesn't recognise, it can BUG in a couple of places, which is
unnecessary as it can easily get back to userspace.

Fix this to print an error message instead.

Fixes: 99455153d067 ("RxRPC: Parse security index 5 keys (Kerberos 5)")
Signed-off-by: David Howells <dhowells@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/rxrpc/key.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/rxrpc/key.c b/net/rxrpc/key.c
index d77e89766406a..32f46edcf7c67 100644
--- a/net/rxrpc/key.c
+++ b/net/rxrpc/key.c
@@ -1108,7 +1108,8 @@ static long rxrpc_read(const struct key *key,
 			break;
 
 		default: /* we have a ticket we can't encode */
-			BUG();
+			pr_err("Unsupported key token type (%u)\n",
+			       token->security_index);
 			continue;
 		}
 
@@ -1224,7 +1225,6 @@ static long rxrpc_read(const struct key *key,
 			break;
 
 		default:
-			BUG();
 			break;
 		}
 
-- 
2.25.1