From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 40E0C1ACB2 for ; Wed, 7 Jun 2023 20:40:12 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B8A54C433EF; Wed, 7 Jun 2023 20:40:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1686170412; bh=cUruHpp5csKVaRsO8925IjftPTB8zY3Vv0Hmu8lUWVE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=zygC3MqVqHZj5bT7lGIeR4/C9q3XHn6Iehz0Mz+JJjo/v0MzZos+OxDv0+n71xz0B HMzX5Fo6oXjC65aHIipmXhjd7R2gc8N6ucJFRiwXgkfBIvvcTFbCrl85VEP6rvF8VW /Z2aFt8eB3kgYEqonSOIo6Rt7oLWs2KY/s33hpu8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yang Lan , Bob Peterson , Andreas Gruenbacher , Sasha Levin Subject: [PATCH 6.1 074/225] gfs2: Dont deref jdesc in evict Date: Wed, 7 Jun 2023 22:14:27 +0200 Message-ID: <20230607200916.797421488@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230607200913.334991024@linuxfoundation.org> References: <20230607200913.334991024@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Bob Peterson [ Upstream commit 504a10d9e46bc37b23d0a1ae2f28973c8516e636 ] On corrupt gfs2 file systems the evict code can try to reference the journal descriptor structure, jdesc, after it has been freed and set to NULL. The sequence of events is: init_journal() ... fail_jindex: gfs2_jindex_free(sdp); <------frees journals, sets jdesc = NULL if (gfs2_holder_initialized(&ji_gh)) gfs2_glock_dq_uninit(&ji_gh); fail: iput(sdp->sd_jindex); <--references jdesc in evict_linked_inode evict() gfs2_evict_inode() evict_linked_inode() ret = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks); <------references the now freed/zeroed sd_jdesc pointer. The call to gfs2_trans_begin is done because the truncate_inode_pages call can cause gfs2 events that require a transaction, such as removing journaled data (jdata) blocks from the journal. This patch fixes the problem by adding a check for sdp->sd_jdesc to function gfs2_evict_inode. In theory, this should only happen to corrupt gfs2 file systems, when gfs2 detects the problem, reports it, then tries to evict all the system inodes it has read in up to that point. Reported-by: Yang Lan Signed-off-by: Bob Peterson Signed-off-by: Andreas Gruenbacher Signed-off-by: Sasha Levin --- fs/gfs2/super.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c index 2015bd05cba10..9d27aa8bd2bc6 100644 --- a/fs/gfs2/super.c +++ b/fs/gfs2/super.c @@ -1380,6 +1380,14 @@ static void gfs2_evict_inode(struct inode *inode) if (inode->i_nlink || sb_rdonly(sb)) goto out; + /* + * In case of an incomplete mount, gfs2_evict_inode() may be called for + * system files without having an active journal to write to. In that + * case, skip the filesystem evict. + */ + if (!sdp->sd_jdesc) + goto out; + gfs2_holder_mark_uninitialized(&gh); ret = evict_should_delete(inode, &gh); if (ret == SHOULD_DEFER_EVICTION) -- 2.39.2