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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 80F1BC55186 for ; Wed, 22 Apr 2020 10:49:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4D1562073A for ; Wed, 22 Apr 2020 10:49:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587552583; bh=A8in5giTD5Iwl6EN+gPYLRg5+rVKYjzLzHAkpHGIlws=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=bAocm2Zawmoxr+ZwaTIXjb9xSZXkBb+i3Nt7ZrAtXqforV7ISBAckzUUJ3lIfxHxs JbhfZWp+WdOp2zd5T7404MXavwWXxKDukZAmVoWNFxtVzGPA1XjXTVE6o08Dfoz4tc HqpUfDkzdVCIE0DdvknPfJWXK6q0FHoUHxqV7RCc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732118AbgDVKtm (ORCPT ); Wed, 22 Apr 2020 06:49:42 -0400 Received: from mail.kernel.org ([198.145.29.99]:46710 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729420AbgDVKNG (ORCPT ); Wed, 22 Apr 2020 06:13:06 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id ACE462087E; Wed, 22 Apr 2020 10:13:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587550386; bh=A8in5giTD5Iwl6EN+gPYLRg5+rVKYjzLzHAkpHGIlws=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Y28fYNXtTLvdUcC63f7CWWsQBcxNlUaxzO4QP66c2hC9xCAEqnWhgPtCqEpA1MUtB rACa9EafLS3VUQg8/RmudBmjMwVD3v01kQpwanE8WO6hyaUM+iycuU9MrEek8hwxyY xEc171rXjiPoejfEVDfuTxqVDcfMKX7Qbk9YEesA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Goldwyn Rodrigues , Mike Snitzer , Sasha Levin Subject: [PATCH 4.14 125/199] dm flakey: check for null arg_name in parse_features() Date: Wed, 22 Apr 2020 11:57:31 +0200 Message-Id: <20200422095109.965957078@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200422095057.806111593@linuxfoundation.org> References: <20200422095057.806111593@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Goldwyn Rodrigues [ Upstream commit 7690e25302dc7d0cd42b349e746fe44b44a94f2b ] One can crash dm-flakey by specifying more feature arguments than the number of features supplied. Checking for null in arg_name avoids this. dmsetup create flakey-test --table "0 66076080 flakey /dev/sdb9 0 0 180 2 drop_writes" Signed-off-by: Goldwyn Rodrigues Signed-off-by: Mike Snitzer Signed-off-by: Sasha Levin --- drivers/md/dm-flakey.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c index b1b68e01b889c..53cd31199f212 100644 --- a/drivers/md/dm-flakey.c +++ b/drivers/md/dm-flakey.c @@ -70,6 +70,11 @@ static int parse_features(struct dm_arg_set *as, struct flakey_c *fc, arg_name = dm_shift_arg(as); argc--; + if (!arg_name) { + ti->error = "Insufficient feature arguments"; + return -EINVAL; + } + /* * drop_writes */ -- 2.20.1