From patchwork Tue Apr 26 08:20:13 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 567935 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 6F57EC433EF for ; Tue, 26 Apr 2022 08:44:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240405AbiDZIrF (ORCPT ); Tue, 26 Apr 2022 04:47:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56742 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346891AbiDZIp2 (ORCPT ); Tue, 26 Apr 2022 04:45:28 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 90F3965DC; Tue, 26 Apr 2022 01:36:18 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 2D440617E7; Tue, 26 Apr 2022 08:36:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 236A3C385A0; Tue, 26 Apr 2022 08:36:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1650962177; bh=F9IihVuh+cy8kK9Rt7DkAAR8plTl6SHz8WpoM3/HKzM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TCtTMfd8qH6Mry8nL+vY/wtzFxiPsiHk3BdqPgBZ8esHQRFJlMzCDIKeOMENTydZv 12ZQCNsyqSsc6WTjSHf3wSDOP1Yg5h5zaiiPAbyeXE1cJFHF+pWSWzQgUA55NCnN4A OPf/ZrT/jCfH14NChINhb3Jb8o0H7/yMyNxhKTk4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+c6fd14145e2f62ca0784@syzkaller.appspotmail.com, Bob Peterson , Andreas Gruenbacher Subject: [PATCH 5.15 012/124] gfs2: assign rgrp glock before compute_bitstructs Date: Tue, 26 Apr 2022 10:20:13 +0200 Message-Id: <20220426081747.648707539@linuxfoundation.org> X-Mailer: git-send-email 2.36.0 In-Reply-To: <20220426081747.286685339@linuxfoundation.org> References: <20220426081747.286685339@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Bob Peterson commit 428f651cb80b227af47fc302e4931791f2fb4741 upstream. Before this patch, function read_rindex_entry called compute_bitstructs before it allocated a glock for the rgrp. But if compute_bitstructs found a problem with the rgrp, it called gfs2_consist_rgrpd, and that called gfs2_dump_glock for rgd->rd_gl which had not yet been assigned. read_rindex_entry compute_bitstructs gfs2_consist_rgrpd gfs2_dump_glock <---------rgd->rd_gl was not set. This patch changes read_rindex_entry so it assigns an rgrp glock before calling compute_bitstructs so gfs2_dump_glock does not reference an unassigned pointer. If an error is discovered, the glock must also be put, so a new goto and label were added. Reported-by: syzbot+c6fd14145e2f62ca0784@syzkaller.appspotmail.com Signed-off-by: Bob Peterson Signed-off-by: Andreas Gruenbacher Signed-off-by: Greg Kroah-Hartman --- fs/gfs2/rgrp.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) --- a/fs/gfs2/rgrp.c +++ b/fs/gfs2/rgrp.c @@ -923,15 +923,15 @@ static int read_rindex_entry(struct gfs2 spin_lock_init(&rgd->rd_rsspin); mutex_init(&rgd->rd_mutex); - error = compute_bitstructs(rgd); - if (error) - goto fail; - error = gfs2_glock_get(sdp, rgd->rd_addr, &gfs2_rgrp_glops, CREATE, &rgd->rd_gl); if (error) goto fail; + error = compute_bitstructs(rgd); + if (error) + goto fail_glock; + rgd->rd_rgl = (struct gfs2_rgrp_lvb *)rgd->rd_gl->gl_lksb.sb_lvbptr; rgd->rd_flags &= ~(GFS2_RDF_UPTODATE | GFS2_RDF_PREFERRED); if (rgd->rd_data > sdp->sd_max_rg_data) @@ -945,6 +945,7 @@ static int read_rindex_entry(struct gfs2 } error = 0; /* someone else read in the rgrp; free it and ignore it */ +fail_glock: gfs2_glock_put(rgd->rd_gl); fail: