From patchwork Mon Mar 29 07:55:34 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 411389 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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, 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 10150C433F8 for ; Mon, 29 Mar 2021 08:30:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CE9E761932 for ; Mon, 29 Mar 2021 08:30:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232540AbhC2I3z (ORCPT ); Mon, 29 Mar 2021 04:29:55 -0400 Received: from mail.kernel.org ([198.145.29.99]:42680 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234277AbhC2I2B (ORCPT ); Mon, 29 Mar 2021 04:28:01 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id C3A68619CF; Mon, 29 Mar 2021 08:27:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1617006432; bh=kGD9Zz7cfSBPI5bkMvB6A+uKjgg/mNyjnW8fvUtKCUY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nEnpY50a+zhB1pttzoCt2qm2ZkSMtRPJYH6pd6+jaXNFSSNuu6f0HqjTVnYat1rYR CE7PrrkX7XCs+bhnvTihLH7Y8clySFBqtjZ3c1QhwlzI7/0RYqC17e0TZPZ9ANoz+A RiSG4TP4bz7wxDkjEGVRAsy0/v6zKD4Oe0sz53Gg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Andy Price , Bob Peterson , Andreas Gruenbacher , Sasha Levin Subject: [PATCH 5.11 018/254] gfs2: fix use-after-free in trans_drain Date: Mon, 29 Mar 2021 09:55:34 +0200 Message-Id: <20210329075633.750442954@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210329075633.135869143@linuxfoundation.org> References: <20210329075633.135869143@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 [ Upstream commit 1a5a2cfd34c17db73c53ef127272c8c1ae220485 ] This patch adds code to function trans_drain to remove drained bd elements from the ail lists, if queued, before freeing the bd. If we don't remove the bd from the ail, function ail_drain will try to reference the bd after it has been freed by trans_drain. Thanks to Andy Price for his analysis of the problem. Reported-by: Andy Price Signed-off-by: Bob Peterson Signed-off-by: Andreas Gruenbacher Signed-off-by: Sasha Levin --- fs/gfs2/log.c | 4 ++++ fs/gfs2/trans.c | 2 ++ 2 files changed, 6 insertions(+) diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c index 2e9314091c81..1955dea999f7 100644 --- a/fs/gfs2/log.c +++ b/fs/gfs2/log.c @@ -935,12 +935,16 @@ static void trans_drain(struct gfs2_trans *tr) while (!list_empty(head)) { bd = list_first_entry(head, struct gfs2_bufdata, bd_list); list_del_init(&bd->bd_list); + if (!list_empty(&bd->bd_ail_st_list)) + gfs2_remove_from_ail(bd); kmem_cache_free(gfs2_bufdata_cachep, bd); } head = &tr->tr_databuf; while (!list_empty(head)) { bd = list_first_entry(head, struct gfs2_bufdata, bd_list); list_del_init(&bd->bd_list); + if (!list_empty(&bd->bd_ail_st_list)) + gfs2_remove_from_ail(bd); kmem_cache_free(gfs2_bufdata_cachep, bd); } } diff --git a/fs/gfs2/trans.c b/fs/gfs2/trans.c index 6d4bf7ea7b3b..7f850ff6a05d 100644 --- a/fs/gfs2/trans.c +++ b/fs/gfs2/trans.c @@ -134,6 +134,8 @@ static struct gfs2_bufdata *gfs2_alloc_bufdata(struct gfs2_glock *gl, bd->bd_bh = bh; bd->bd_gl = gl; INIT_LIST_HEAD(&bd->bd_list); + INIT_LIST_HEAD(&bd->bd_ail_st_list); + INIT_LIST_HEAD(&bd->bd_ail_gl_list); bh->b_private = bd; return bd; }