From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751277AbdFBPoP (ORCPT ); Fri, 2 Jun 2017 11:44:15 -0400 Received: from mail-wr0-f193.google.com ([209.85.128.193]:35204 "EHLO mail-wr0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750813AbdFBPoM (ORCPT ); Fri, 2 Jun 2017 11:44:12 -0400 From: =?UTF-8?q?Pali=20Roh=C3=A1r?= To: Joern Engel , David Woodhouse , Brian Norris , Boris Brezillon , Marek Vasut , Richard Weinberger , Cyrille Pitchen , Artem Bityutskiy Cc: linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org, =?UTF-8?q?Pali=20Roh=C3=A1r?= Subject: [PATCH 1/5] mtd: block2mtd: Check for valid user supplied erase size Date: Fri, 2 Jun 2017 17:43:38 +0200 Message-Id: <1496418222-23483-2-git-send-email-pali.rohar@gmail.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1496418222-23483-1-git-send-email-pali.rohar@gmail.com> References: <1496418222-23483-1-git-send-email-pali.rohar@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Erase size is limited to 32bit unsigned integer, but value parsed from user is limited up to size_t C type. Signed-off-by: Pali Rohár --- drivers/mtd/devices/block2mtd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mtd/devices/block2mtd.c b/drivers/mtd/devices/block2mtd.c index 7c887f1..ee47cdd 100644 --- a/drivers/mtd/devices/block2mtd.c +++ b/drivers/mtd/devices/block2mtd.c @@ -419,7 +419,7 @@ static int block2mtd_setup2(const char *val) if (token[1]) { ret = parse_num(&erase_size, token[1]); - if (ret) { + if (ret || erase_size > U32_MAX) { pr_err("illegal erase size\n"); return 0; } -- 1.7.9.5