From patchwork Thu May 20 09:16:17 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 445807 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=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, 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 9A3BDC43460 for ; Thu, 20 May 2021 09:39:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 723CF6191A for ; Thu, 20 May 2021 09:39:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232670AbhETJlB (ORCPT ); Thu, 20 May 2021 05:41:01 -0400 Received: from mail.kernel.org ([198.145.29.99]:40274 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233147AbhETJhx (ORCPT ); Thu, 20 May 2021 05:37:53 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 00DD061417; Thu, 20 May 2021 09:30:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621503031; bh=dIQwHZRW1nuaV/U8JlEyKoa47ZeXRKYoOtsBAICauTk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=W26Gm+n69oYy0aZBuLYWiRYKCTXqAh07Iwiy8XYNK1jQL42gafJNeePVZK13+Ufvb aCef/o1V7z6Yc2a3TPJ7KxfWCzkZ9nAMD+SvDLzY2SC/fiI4EJwFUx3Dd9daxjR3Pa Bt9TEA7fcYjr3Es1MXpPf2aOHZ9pFvcTttozgNNQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jeffrey Mitchell , Tyler Hicks Subject: [PATCH 4.19 008/425] ecryptfs: fix kernel panic with null dev_name Date: Thu, 20 May 2021 11:16:17 +0200 Message-Id: <20210520092131.605786210@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210520092131.308959589@linuxfoundation.org> References: <20210520092131.308959589@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Jeffrey Mitchell commit 9046625511ad8dfbc8c6c2de16b3532c43d68d48 upstream. When mounting eCryptfs, a null "dev_name" argument to ecryptfs_mount() causes a kernel panic if the parsed options are valid. The easiest way to reproduce this is to call mount() from userspace with an existing eCryptfs mount's options and a "source" argument of 0. Error out if "dev_name" is null in ecryptfs_mount() Fixes: 237fead61998 ("[PATCH] ecryptfs: fs/Makefile and fs/Kconfig") Cc: stable@vger.kernel.org Signed-off-by: Jeffrey Mitchell Signed-off-by: Tyler Hicks Signed-off-by: Greg Kroah-Hartman --- fs/ecryptfs/main.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/fs/ecryptfs/main.c +++ b/fs/ecryptfs/main.c @@ -506,6 +506,12 @@ static struct dentry *ecryptfs_mount(str goto out; } + if (!dev_name) { + rc = -EINVAL; + err = "Device name cannot be null"; + goto out; + } + rc = ecryptfs_parse_options(sbi, raw_data, &check_ruid); if (rc) { err = "Error parsing options";