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=-14.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 DD0A0C433E1 for ; Mon, 24 Aug 2020 16:59:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A1EBC2067C for ; Mon, 24 Aug 2020 16:59:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598288393; bh=0T4zPC5JFeMjiOz5QfuMmWoz2MjWto/85jlqA8H2gUo=; h=From:To:Cc:Subject:Date:List-ID:From; b=2CpdfvshWDo/LHDvMKm7HJwQzJfISZ95yWfE/cLMAPIG+Bd1zW4Jc4dL81rAGDQ+G RDIbJL0L4l842jngUM2XWO/p1BmQ0hhyo+sX2ILbYILBshfx69GpkXbZeXUGMbLa5z OHDRPTb+IjHL3QVIstmryifxwjRIp3TOgT91xCbQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726090AbgHXQ7w (ORCPT ); Mon, 24 Aug 2020 12:59:52 -0400 Received: from mail.kernel.org ([198.145.29.99]:40124 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725962AbgHXQis (ORCPT ); Mon, 24 Aug 2020 12:38:48 -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 D2E9622CE3; Mon, 24 Aug 2020 16:38:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598287127; bh=0T4zPC5JFeMjiOz5QfuMmWoz2MjWto/85jlqA8H2gUo=; h=From:To:Cc:Subject:Date:From; b=UmDDyAMWU4nATaVSCnHLaaQzArXM4veYnSjnhlzu245R5mjGHG1kFFaSMiPoxz+t5 F2nOgvDQeGf6Hq7fN+3xtpjzzFDpg/FDhw3SCAP693Z8Alw/wvG+MmEcHEdPWMqQJe riXNaiUuMlQaCSh3EfVvatY55HblpbfsWKF+1tLg= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Lukas Czerner , Jan Kara , Theodore Ts'o , Sasha Levin , linux-ext4@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 01/21] jbd2: make sure jh have b_transaction set in refile/unfile_buffer Date: Mon, 24 Aug 2020 12:38:25 -0400 Message-Id: <20200824163845.606933-1-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-stable: review 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: Lukas Czerner [ Upstream commit 24dc9864914eb5813173cfa53313fcd02e4aea7d ] Callers of __jbd2_journal_unfile_buffer() and __jbd2_journal_refile_buffer() assume that the b_transaction is set. In fact if it's not, we can end up with journal_head refcounting errors leading to crash much later that might be very hard to track down. Add asserts to make sure that is the case. We also make sure that b_next_transaction is NULL in __jbd2_journal_unfile_buffer() since the callers expect that as well and we should not get into that stage in this state anyway, leading to problems later on if we do. Tested with fstests. Signed-off-by: Lukas Czerner Reviewed-by: Jan Kara Link: https://lore.kernel.org/r/20200617092549.6712-1-lczerner@redhat.com Signed-off-by: Theodore Ts'o Signed-off-by: Sasha Levin --- fs/jbd2/transaction.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c index 43693b6797105..5a0de78a5d71a 100644 --- a/fs/jbd2/transaction.c +++ b/fs/jbd2/transaction.c @@ -1915,6 +1915,9 @@ static void __jbd2_journal_temp_unlink_buffer(struct journal_head *jh) */ static void __jbd2_journal_unfile_buffer(struct journal_head *jh) { + J_ASSERT_JH(jh, jh->b_transaction != NULL); + J_ASSERT_JH(jh, jh->b_next_transaction == NULL); + __jbd2_journal_temp_unlink_buffer(jh); jh->b_transaction = NULL; jbd2_journal_put_journal_head(jh); @@ -2462,6 +2465,13 @@ void __jbd2_journal_refile_buffer(struct journal_head *jh) was_dirty = test_clear_buffer_jbddirty(bh); __jbd2_journal_temp_unlink_buffer(jh); + + /* + * b_transaction must be set, otherwise the new b_transaction won't + * be holding jh reference + */ + J_ASSERT_JH(jh, jh->b_transaction != NULL); + /* * We set b_transaction here because b_next_transaction will inherit * our jh reference and thus __jbd2_journal_file_buffer() must not -- 2.25.1