Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754405AbbGaTwj (ORCPT ); Fri, 31 Jul 2015 15:52:39 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:46389 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753298AbbGaTwd (ORCPT ); Fri, 31 Jul 2015 15:52:33 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mikulas Patocka , Mike Snitzer Subject: [PATCH 4.1 114/267] dm stats: fix divide by zero if number_of_areas arg is zero Date: Fri, 31 Jul 2015 12:39:25 -0700 Message-Id: <20150731194005.490464717@linuxfoundation.org> X-Mailer: git-send-email 2.5.0 In-Reply-To: <20150731194001.933895871@linuxfoundation.org> References: <20150731194001.933895871@linuxfoundation.org> User-Agent: quilt/0.64 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: 1093 Lines: 37 4.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Mikulas Patocka commit dd4c1b7d0c95be1c9245118a3accc41a16f1db67 upstream. If the number_of_areas argument was zero the kernel would crash on div-by-zero. Add better input validation. Signed-off-by: Mikulas Patocka Signed-off-by: Mike Snitzer Signed-off-by: Greg Kroah-Hartman --- drivers/md/dm-stats.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/md/dm-stats.c +++ b/drivers/md/dm-stats.c @@ -795,6 +795,8 @@ static int message_stats_create(struct m return -EINVAL; if (sscanf(argv[2], "/%u%c", &divisor, &dummy) == 1) { + if (!divisor) + return -EINVAL; step = end - start; if (do_div(step, divisor)) step++; -- 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/