From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752820AbcKYIbU (ORCPT ); Fri, 25 Nov 2016 03:31:20 -0500 Received: from mx2.suse.de ([195.135.220.15]:45255 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752053AbcKYIa5 (ORCPT ); Fri, 25 Nov 2016 03:30:57 -0500 X-Amavis-Alert: BAD HEADER SECTION, Duplicate header field: "References" From: Jiri Slaby To: stable@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Johan Hovold , Jiri Slaby Subject: [PATCH 3.12 026/127] USB: serial: cp210x: fix tiocmget error handling Date: Fri, 25 Nov 2016 09:28:59 +0100 Message-Id: <1dc4edef2413dffc53c452f3ba5bd34d71a8eb88.1480062521.git.jslaby@suse.cz> X-Mailer: git-send-email 2.10.2 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Johan Hovold 3.12-stable review patch. If anyone has any objections, please let me know. =============== commit de24e0a108bc48062e1c7acaa97014bce32a919f upstream. The current tiocmget implementation would fail to report errors up the stack and instead leaked a few bits from the stack as a mask of modem-status flags. Fixes: 39a66b8d22a3 ("[PATCH] USB: CP2101 Add support for flow control") Signed-off-by: Johan Hovold Signed-off-by: Jiri Slaby --- drivers/usb/serial/cp210x.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c index f5e4fda7f902..188e50446514 100644 --- a/drivers/usb/serial/cp210x.c +++ b/drivers/usb/serial/cp210x.c @@ -919,7 +919,9 @@ static int cp210x_tiocmget(struct tty_struct *tty) unsigned int control; int result; - cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1); + result = cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1); + if (result) + return result; result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) |((control & CONTROL_RTS) ? TIOCM_RTS : 0) -- 2.10.2