netdev - [PATCH net 2/2] rxrpc: Fix a memory leak in rxkad_verify

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Message-ID: <159019096638.999797.12399237571817646198.stgit@warthog.procyon.org.uk>
Date:   Sat, 23 May 2020 00:42:46 +0100
From:   David Howells <dhowells@...hat.com>
To:     netdev@...r.kernel.org
Cc:     Qiushi Wu <wu000273@....edu>,
        Markus Elfring <Markus.Elfring@....de>, dhowells@...hat.com,
        linux-afs@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH net 2/2] rxrpc: Fix a memory leak in rxkad_verify_response()
 [ver #2]

From: Qiushi Wu <wu000273@....edu>

A ticket was not released after a call of the function
"rxkad_decrypt_ticket" failed. Thus replace the jump target
"temporary_error_free_resp" by "temporary_error_free_ticket".

Fixes: 8c2f826dc3631 ("rxrpc: Don't put crypto buffers on the stack")
Signed-off-by: Qiushi Wu <wu000273@....edu>
Signed-off-by: David Howells <dhowells@...hat.com>
cc: Markus Elfring <Markus.Elfring@....de>
---

 net/rxrpc/rxkad.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/net/rxrpc/rxkad.c b/net/rxrpc/rxkad.c
index 098f1f9ec53b..52a24d4ef5d8 100644
--- a/net/rxrpc/rxkad.c
+++ b/net/rxrpc/rxkad.c
@@ -1148,7 +1148,7 @@ static int rxkad_verify_response(struct rxrpc_connection *conn,
 	ret = rxkad_decrypt_ticket(conn, skb, ticket, ticket_len, &session_key,
 				   &expiry, _abort_code);
 	if (ret < 0)
-		goto temporary_error_free_resp;
+		goto temporary_error_free_ticket;
 
 	/* use the session key from inside the ticket to decrypt the
 	 * response */
@@ -1230,7 +1230,6 @@ static int rxkad_verify_response(struct rxrpc_connection *conn,
 
 temporary_error_free_ticket:
 	kfree(ticket);
-temporary_error_free_resp:
 	kfree(response);
 temporary_error:
 	/* Ignore the response packet if we got a temporary error such as