Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752361AbdCPOcw (ORCPT ); Thu, 16 Mar 2017 10:32:52 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:60200 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751549AbdCPOcq (ORCPT ); Thu, 16 Mar 2017 10:32:46 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ben Hutchings , Johan Hovold Subject: [PATCH 4.4 02/35] USB: serial: digi_acceleport: fix OOB-event processing Date: Thu, 16 Mar 2017 23:29:21 +0900 Message-Id: <20170316142906.895165657@linuxfoundation.org> X-Mailer: git-send-email 2.12.0 In-Reply-To: <20170316142906.685052998@linuxfoundation.org> References: <20170316142906.685052998@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 Content-Length: 1267 Lines: 38 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Johan Hovold commit 2e46565cf622dd0534a9d8bffe152a577b48d7aa upstream. A recent change claimed to fix an off-by-one error in the OOB-port completion handler, but instead introduced such an error. This could specifically led to modem-status changes going unnoticed, effectively breaking TIOCMGET. Note that the offending commit fixes a loop-condition underflow and is marked for stable, but should not be backported without this fix. Reported-by: Ben Hutchings Fixes: 2d380889215f ("USB: serial: digi_acceleport: fix OOB data sanity check") Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/digi_acceleport.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/usb/serial/digi_acceleport.c +++ b/drivers/usb/serial/digi_acceleport.c @@ -1492,7 +1492,7 @@ static int digi_read_oob_callback(struct return -1; /* handle each oob command */ - for (i = 0; i < urb->actual_length - 4; i += 4) { + for (i = 0; i < urb->actual_length - 3; i += 4) { opcode = buf[i]; line = buf[i + 1]; status = buf[i + 2];