From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752686AbdLLMqZ (ORCPT ); Tue, 12 Dec 2017 07:46:25 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:58822 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752155AbdLLMqV (ORCPT ); Tue, 12 Dec 2017 07:46:21 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jimmy Assarsson , Marc Kleine-Budde Subject: [PATCH 4.14 012/164] can: kvaser_usb: Fix comparison bug in kvaser_usb_read_bulk_callback() Date: Tue, 12 Dec 2017 13:43:12 +0100 Message-Id: <20171212123444.359595592@linuxfoundation.org> X-Mailer: git-send-email 2.15.1 In-Reply-To: <20171212123443.785979602@linuxfoundation.org> References: <20171212123443.785979602@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jimmy Assarsson commit e84f44eb5523401faeb9cc1c97895b68e3cfb78d upstream. The conditon in the while-loop becomes true when actual_length is less than 2 (MSG_HEADER_LEN). In best case we end up with a former, already dispatched msg, that got msg->len greater than actual_length. This will result in a "Format error" error printout. Problem seen when unplugging a Kvaser USB device connected to a vbox guest. warning: comparison between signed and unsigned integer expressions [-Wsign-compare] Signed-off-by: Jimmy Assarsson Signed-off-by: Marc Kleine-Budde Signed-off-by: Greg Kroah-Hartman --- drivers/net/can/usb/kvaser_usb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/net/can/usb/kvaser_usb.c +++ b/drivers/net/can/usb/kvaser_usb.c @@ -1334,7 +1334,7 @@ static void kvaser_usb_read_bulk_callbac goto resubmit_urb; } - while (pos <= urb->actual_length - MSG_HEADER_LEN) { + while (pos <= (int)(urb->actual_length - MSG_HEADER_LEN)) { msg = urb->transfer_buffer + pos; /* The Kvaser firmware can only read and write messages that