From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 800CFC4360F for ; Wed, 27 Mar 2019 19:02:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 480F8206B7 for ; Wed, 27 Mar 2019 19:02:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553713338; bh=lfiBhph8mEY6ye+tzJJ3XXwVknBO83oluTVaVYOqDFs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=M9OUs0S7K2krpqfPY6/1oR5WN0NF4U+v2oJ7Xx5u+/d7heZJOCUx9EgVvzLZOOdp2 sIUwtgeDe0q9vzY9eOJcaYkCQs1vBk2YHR0GKd8CHbAyBj/8YIbQCvM/hAu+fgxdnE W8ww9B2WzhGf8I/9iYw8TWP9FRA0dZUU1b9RpEJk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389516AbfC0SNv (ORCPT ); Wed, 27 Mar 2019 14:13:51 -0400 Received: from mail.kernel.org ([198.145.29.99]:56592 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389494AbfC0SNs (ORCPT ); Wed, 27 Mar 2019 14:13:48 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 46B1D2186A; Wed, 27 Mar 2019 18:13:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553710428; bh=lfiBhph8mEY6ye+tzJJ3XXwVknBO83oluTVaVYOqDFs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YLMav/pYTjFLsdkI4bQ2yTpKu4keiLOQZNyHnOk+yIFZNNiqjrf4Jqwb0ODCw54hm Dq6Q3Qa5sqdgAFfhxRAeRlCgyc4nJ0jESENUb9BcweInKdbHy4TxrviAYbmSgjuvuG ELy2VHCOnuBgrt9JPiEk5wH4JJCer5Gag3eBM64k= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Coly Li , Jens Axboe , Sasha Levin , linux-bcache@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 114/192] bcache: fix input overflow to sequential_cutoff Date: Wed, 27 Mar 2019 14:09:06 -0400 Message-Id: <20190327181025.13507-114-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190327181025.13507-1-sashal@kernel.org> References: <20190327181025.13507-1-sashal@kernel.org> MIME-Version: 1.0 X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Coly Li [ Upstream commit 8c27a3953e92eb0b22dbb03d599f543a05f9574e ] People may set sequential_cutoff of a cached device via sysfs file, but current code does not check input value overflow. E.g. if value 4294967295 (UINT_MAX) is written to file sequential_cutoff, its value is 4GB, but if 4294967296 (UINT_MAX + 1) is written into, its value will be 0. This is an unexpected behavior. This patch replaces d_strtoi_h() by sysfs_strtoul_clamp() to convert input string to unsigned integer value, and limit its range in [0, UINT_MAX]. Then the input overflow can be fixed. Signed-off-by: Coly Li Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- drivers/md/bcache/sysfs.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c index 59bf13faf752..01c7c4452a26 100644 --- a/drivers/md/bcache/sysfs.c +++ b/drivers/md/bcache/sysfs.c @@ -295,7 +295,9 @@ STORE(__cached_dev) dc->io_disable = v ? 1 : 0; } - d_strtoi_h(sequential_cutoff); + sysfs_strtoul_clamp(sequential_cutoff, + dc->sequential_cutoff, + 0, UINT_MAX); d_strtoi_h(readahead); if (attr == &sysfs_clear_stats) -- 2.19.1