linux-kernel - [PATCH 4.14 56/59] rxrpc: Fix a memory leak in rxkad_verify

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Date:   Tue, 26 May 2020 20:53:41 +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, Qiushi Wu <wu000273@....edu>,
        David Howells <dhowells@...hat.com>,
        Markus Elfring <Markus.Elfring@....de>
Subject: [PATCH 4.14 56/59] rxrpc: Fix a memory leak in rxkad_verify_response()

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

commit f45d01f4f30b53c3a0a1c6c1c154acb7ff74ab9f upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/net/rxrpc/rxkad.c
+++ b/net/rxrpc/rxkad.c
@@ -1111,7 +1111,7 @@ static int rxkad_verify_response(struct
 	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 */
@@ -1193,7 +1193,6 @@ protocol_error:
 
 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