From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758906Ab3K0B46 (ORCPT ); Tue, 26 Nov 2013 20:56:58 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:38965 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757500Ab3K0A5R (ORCPT ); Tue, 26 Nov 2013 19:57:17 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Johan Hovold Subject: [PATCH 3.10 06/80] USB: mos7840: fix tiocmget error handling Date: Tue, 26 Nov 2013 16:56:35 -0800 Message-Id: <20131127005641.381246787@linuxfoundation.org> X-Mailer: git-send-email 1.8.5.rc3 In-Reply-To: <20131127005640.934155527@linuxfoundation.org> References: <20131127005640.934155527@linuxfoundation.org> User-Agent: quilt/0.60-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Johan Hovold commit a91ccd26e75235d86248d018fe3779732bcafd8d upstream. Make sure to return errors from tiocmget rather than rely on uninitialised stack data. Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/mos7840.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/drivers/usb/serial/mos7840.c +++ b/drivers/usb/serial/mos7840.c @@ -1593,7 +1593,11 @@ static int mos7840_tiocmget(struct tty_s return -ENODEV; status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr); + if (status != 1) + return -EIO; status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr); + if (status != 1) + return -EIO; result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0) | ((mcr & MCR_RTS) ? TIOCM_RTS : 0) | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)