Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754707Ab2KNGc4 (ORCPT ); Wed, 14 Nov 2012 01:32:56 -0500 Received: from mail-pa0-f46.google.com ([209.85.220.46]:59367 "EHLO mail-pa0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752977Ab2KNGcz (ORCPT ); Wed, 14 Nov 2012 01:32:55 -0500 From: Kumar Amit Mehta To: gregkh@linuxfoundation.org Cc: wfp5p@virginia.edu, geert@linux-m68k.org, devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [PATCH] staging: dgrp: dgrp_tty.c: return an -EFAULT if put_user fails Date: Wed, 14 Nov 2012 12:02:21 +0530 Message-Id: <1352874741-18526-1-git-send-email-gmate.amit@gmail.com> X-Mailer: git-send-email 1.7.9.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1777 Lines: 50 This fix adds checks for inspecting the return value of put_user() and return -EFAULT on error. Signed-off-by: Kumar Amit Mehta --- drivers/staging/dgrp/dgrp_tty.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/staging/dgrp/dgrp_tty.c b/drivers/staging/dgrp/dgrp_tty.c index e125b03..b294197 100644 --- a/drivers/staging/dgrp/dgrp_tty.c +++ b/drivers/staging/dgrp/dgrp_tty.c @@ -2265,7 +2265,8 @@ static int get_modem_info(struct ch_struct *ch, unsigned int *value) | ((mlast & DM_RI) ? TIOCM_RNG : 0) | ((mlast & DM_DSR) ? TIOCM_DSR : 0) | ((mlast & DM_CTS) ? TIOCM_CTS : 0); - put_user(mlast, (unsigned int __user *) value); + if (put_user(mlast, (unsigned int __user *) value)) + return -EFAULT; return 0; } @@ -2620,7 +2621,8 @@ static int dgrp_tty_ioctl(struct tty_struct *tty, unsigned int cmd, sizeof(long)); if (rc == 0) return -EFAULT; - put_user(C_CLOCAL(tty) ? 1 : 0, (unsigned long __user *) arg); + if (put_user(C_CLOCAL(tty) ? 1 : 0, (unsigned long __user *) arg)) + return -EFAULT; return 0; case TIOCSSOFTCAR: @@ -2854,7 +2856,8 @@ static int dgrp_tty_ioctl(struct tty_struct *tty, unsigned int cmd, rc = access_ok(VERIFY_WRITE, (void __user *) arg, sizeof(int)); if (rc == 0) return -EFAULT; - put_user(ch->ch_custom_speed, (unsigned int __user *) arg); + if (put_user(ch->ch_custom_speed, (unsigned int __user *) arg)) + return -EFAULT; break; case DIGI_SETCUSTOMBAUD: -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/