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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3289EC4167B for ; Fri, 30 Dec 2022 11:00:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234768AbiL3LAH (ORCPT ); Fri, 30 Dec 2022 06:00:07 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57422 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234376AbiL3LAD (ORCPT ); Fri, 30 Dec 2022 06:00:03 -0500 Received: from mail-pj1-x1031.google.com (mail-pj1-x1031.google.com [IPv6:2607:f8b0:4864:20::1031]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 404D71A819 for ; Fri, 30 Dec 2022 03:00:02 -0800 (PST) Received: by mail-pj1-x1031.google.com with SMTP id o1-20020a17090a678100b00219cf69e5f0so25477704pjj.2 for ; Fri, 30 Dec 2022 03:00:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=ahkStRU6mZ/j+Lj49hs0SrtIZtOi4h+JM4lKoZJx6Y0=; b=e3HEINbnqThpfVCwEBmANE9t6wazfU0CqSlTPViHpaoGjovSAYUApwjFm3t8bmC8l6 msnEcLQsf9yJERT6yLriiVMPvG/rqyHdhMf7Oc4EVeTnLUlny2erObvsxbvgWLc94I0I Hfp398jakVZquSf0v2Q9BHn1P6pKwBQHP5I/dLz8yzRL9RQxcpX34Zxq9OvNceDdZeyw SzgJQgzUYuE2KS+7/VcVwbRdxLh6rmG4s8b1YGed1CLJSkOoRtVcy4imn6UJsTICbBWQ /pEPtUxYaFybK7GN6cWXHifeJEDCzReTOMtohU/fvz18qaMAUIZZH5Gnwn+xEAQ/wB/2 eufg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=ahkStRU6mZ/j+Lj49hs0SrtIZtOi4h+JM4lKoZJx6Y0=; b=QeC3Z7W+1wmfrhSyvR3yRg3BPQKbjIAQY1/a+Qxtu3rs3PbHjMnUb5/DCnlnZivrZ5 0HkezCnyH/Esduwc5eHzTTLmspj/Lkhty4SSHfpd03edM33BqclZ/fcrAmsWS1VNSTFr /+hdQxe5NcMrw5OFny0vd9qddOrnQtA+FS2vazGhpYmIv4QnNz4Jvr5j6Cgz3JDlwD/F H5dC/Vz3fONrM3EJRqQaVlWgYqDIdfJwM2u6uU+V+lDW7io2vmCxWmtjatEg5hCCXZeI ENWdl8KS/LpA7C7TXp2WJevvCdWI/BACLrOFKRleckMAjU6AAUEEESfH9jWUM701Snmc RqJA== X-Gm-Message-State: AFqh2koXu+spRc48TZ4bJ69wejT7IOV/FSXWsTRHApM2Fa8tayeR0joy Jo7Fs0VMqHEmlSusrWrV7+aRUA== X-Google-Smtp-Source: AMrXdXsyQDUkLuk1pPCTuqvSh6hUujgj2sq5fk5LduCCvyPo3tu6i7R7rVxBV7hT5ru5hZfHl2QdfQ== X-Received: by 2002:a17:902:848d:b0:189:5f5c:da1d with SMTP id c13-20020a170902848d00b001895f5cda1dmr31017474plo.18.1672398001764; Fri, 30 Dec 2022 03:00:01 -0800 (PST) Received: from niej-dt-7B47.. (80.251.214.228.16clouds.com. [80.251.214.228]) by smtp.gmail.com with ESMTPSA id n6-20020a170903110600b00186a437f4d7sm14662525plh.147.2022.12.30.02.59.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Dec 2022 03:00:01 -0800 (PST) From: Jun Nie To: tytso@mit.edu, adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org Cc: tudor.ambarus@linaro.org Subject: [PATCH 2/2] ext4: refuse to create ea block when umounted Date: Fri, 30 Dec 2022 19:00:16 +0800 Message-Id: <20221230110016.476621-2-jun.nie@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221230110016.476621-1-jun.nie@linaro.org> References: <20221230110016.476621-1-jun.nie@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The ea block expansion need to access s_root while it is already set as NULL when umount is triggered. Refuse this request to avoid panic. Reported-by: syzbot+2dacb8f015bf1420155f@syzkaller.appspotmail.com Link: https://syzkaller.appspot.com/bug?id=3613786cb88c93aa1c6a279b1df6a7b201347d08 Signed-off-by: Jun Nie --- fs/ext4/xattr.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c index 235a517d9c17..ac58494e49b6 100644 --- a/fs/ext4/xattr.c +++ b/fs/ext4/xattr.c @@ -1422,6 +1422,12 @@ static struct inode *ext4_xattr_inode_create(handle_t *handle, uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) }; int err; + if (inode->i_sb->s_root == NULL) { + ext4_error(inode->i_sb, + "refuse to create EA inode when umounting"); + return ERR_PTR(-EINVAL); + } + /* * Let the next inode be the goal, so we try and allocate the EA inode * in the same group, or nearby one. -- 2.34.1