From patchwork Tue Sep 1 15:10:17 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 264821 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=-13.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, 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 C3D16C433E6 for ; Tue, 1 Sep 2020 15:15:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 95BBD20767 for ; Tue, 1 Sep 2020 15:15:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598973348; bh=I5sszpnEsWLW9bceSHEeRvrJ/DB70tDxtWUEm34wodg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ZjkukuMFTVG0tLdELfZTWXdNGR72jaPGDhujtQ3gU5+POBYpTJfeyj+NVPtwFT0n3 /T9n+Rki4T4vSZzVhH+pHTXdyfbS+guYt3Y15OJ65NFoGQu+oVraNy3V7cnPU70+u7 mjDLuurE2v8VksSx8754aZE98dhZI3VWeZ8y8Gcg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729232AbgIAPPq (ORCPT ); Tue, 1 Sep 2020 11:15:46 -0400 Received: from mail.kernel.org ([198.145.29.99]:60160 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729228AbgIAPPm (ORCPT ); Tue, 1 Sep 2020 11:15:42 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (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 270F120BED; Tue, 1 Sep 2020 15:15:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598973341; bh=I5sszpnEsWLW9bceSHEeRvrJ/DB70tDxtWUEm34wodg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hISJ2K2j/LzPCb2EDWVk2wn7i/dCgof1eSM4dkgeU0R0bBxh0BGJ7IDeNg4gh+HSz jqdZiH6/n8eKsPBbmPPe5j9bxqRAJxYEPihk6DZiiYpWxfvfwEwSyVz9Il0R39Izpb wwsoNk2M7agQr6OXJD/JuTk1oxAm21otGV9mAcns= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Lukas Czerner , Jan Kara , Theodore Tso , Sasha Levin Subject: [PATCH 4.9 41/78] jbd2: make sure jh have b_transaction set in refile/unfile_buffer Date: Tue, 1 Sep 2020 17:10:17 +0200 Message-Id: <20200901150926.807375332@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200901150924.680106554@linuxfoundation.org> References: <20200901150924.680106554@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@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 8de458d64134a..1478512ecab3e 100644 --- a/fs/jbd2/transaction.c +++ b/fs/jbd2/transaction.c @@ -1896,6 +1896,9 @@ 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); @@ -2443,6 +2446,13 @@ 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