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=-6.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 D4A08C43381 for ; Mon, 1 Apr 2019 17:31:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A2B2720830 for ; Mon, 1 Apr 2019 17:31:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1554139887; bh=3GufNxwdMRHhWtE4Qqfuto881NBdsusSdLjgY0D/A/g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=lx8lE/jgomc4SdMcjdnlaU02dom5plQa6ny1sBsW4eqSU2pzVH4ov9sacwH6B9RMQ wvWIPYl/YxKLWzdKtxqp8jeWc7MwMDBhDiIxJ1cqnKZIoOcAve9rvWfocvZRgT3XiQ nh5GrLBe8Y6PakdH4r5vnJZjoVekUI969xLMuWrA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733253AbfDARb0 (ORCPT ); Mon, 1 Apr 2019 13:31:26 -0400 Received: from mail.kernel.org ([198.145.29.99]:38860 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732850AbfDARbV (ORCPT ); Mon, 1 Apr 2019 13:31:21 -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 A7C1520880; Mon, 1 Apr 2019 17:31:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1554139881; bh=3GufNxwdMRHhWtE4Qqfuto881NBdsusSdLjgY0D/A/g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bhfC0HDUhlQI1T0CIjtXyLCtmLouoN3b6lCw7tGWhqgniUoOgrCOVsLDREkP++Smc lz6xJGSDF3iOWs1qeEcywpSzoi2Fy/BSZFiHRAFC63FsswXb/2Ai8JuffHKinp14ix iJd2vTVs30SdwLHoEPB/RH1sA5eAp1JNRU0FqYbs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jiufei Xue , Theodore Tso , Joseph Qi , stable@kernel.org Subject: [PATCH 4.4 007/131] ext4: fix NULL pointer dereference while journal is aborted Date: Mon, 1 Apr 2019 19:01:17 +0200 Message-Id: <20190401170052.359659140@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190401170051.645954551@linuxfoundation.org> References: <20190401170051.645954551@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore 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 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jiufei Xue commit fa30dde38aa8628c73a6dded7cb0bba38c27b576 upstream. We see the following NULL pointer dereference while running xfstests generic/475: BUG: unable to handle kernel NULL pointer dereference at 0000000000000008 PGD 8000000c84bad067 P4D 8000000c84bad067 PUD c84e62067 PMD 0 Oops: 0000 [#1] SMP PTI CPU: 7 PID: 9886 Comm: fsstress Kdump: loaded Not tainted 5.0.0-rc8 #10 RIP: 0010:ext4_do_update_inode+0x4ec/0x760 ... Call Trace: ? jbd2_journal_get_write_access+0x42/0x50 ? __ext4_journal_get_write_access+0x2c/0x70 ? ext4_truncate+0x186/0x3f0 ext4_mark_iloc_dirty+0x61/0x80 ext4_mark_inode_dirty+0x62/0x1b0 ext4_truncate+0x186/0x3f0 ? unmap_mapping_pages+0x56/0x100 ext4_setattr+0x817/0x8b0 notify_change+0x1df/0x430 do_truncate+0x5e/0x90 ? generic_permission+0x12b/0x1a0 This is triggered because the NULL pointer handle->h_transaction was dereferenced in function ext4_update_inode_fsync_trans(). I found that the h_transaction was set to NULL in jbd2__journal_restart but failed to attached to a new transaction while the journal is aborted. Fix this by checking the handle before updating the inode. Fixes: b436b9bef84d ("ext4: Wait for proper transaction commit on fsync") Signed-off-by: Jiufei Xue Signed-off-by: Theodore Ts'o Reviewed-by: Joseph Qi Cc: stable@kernel.org Signed-off-by: Greg Kroah-Hartman --- fs/ext4/ext4_jbd2.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/fs/ext4/ext4_jbd2.h +++ b/fs/ext4/ext4_jbd2.h @@ -372,7 +372,7 @@ static inline void ext4_update_inode_fsy { struct ext4_inode_info *ei = EXT4_I(inode); - if (ext4_handle_valid(handle)) { + if (ext4_handle_valid(handle) && !is_handle_aborted(handle)) { ei->i_sync_tid = handle->h_transaction->t_tid; if (datasync) ei->i_datasync_tid = handle->h_transaction->t_tid;