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=-13.1 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 1C86FC388F7 for ; Tue, 10 Nov 2020 04:01:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C764F21D46 for ; Tue, 10 Nov 2020 04:01:02 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="LShcutav" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732653AbgKJEA7 (ORCPT ); Mon, 9 Nov 2020 23:00:59 -0500 Received: from mail.kernel.org ([198.145.29.99]:57376 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731634AbgKJDzq (ORCPT ); Mon, 9 Nov 2020 22:55:46 -0500 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 05EDD221E9; Tue, 10 Nov 2020 03:55:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604980545; bh=VA+y975yS8kWIx+XMVvfAypuGIsmBZ4s9vz4ij4d3dU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LShcutavnN9fz6my4oYV39lUcdiP8rJpoGT8kLjAb1kYX4OiIDmCkv475oUXyMh+K asv1uBvAXw8YlhOAWl7Dd2ISB1dcXG4RhQ1jOEZBL4XYiQZKFz4M3uN8t1Uw0ziNXD uOvi1KxWOxQSp2Vf+j7BZSo6TKXSKSGaXKtSX614= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Bob Peterson , Andreas Gruenbacher , Sasha Levin , cluster-devel@redhat.com Subject: [PATCH AUTOSEL 4.19 03/21] gfs2: Free rd_bits later in gfs2_clear_rgrpd to fix use-after-free Date: Mon, 9 Nov 2020 22:55:23 -0500 Message-Id: <20201110035541.424648-3-sashal@kernel.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20201110035541.424648-1-sashal@kernel.org> References: <20201110035541.424648-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Bob Peterson [ Upstream commit d0f17d3883f1e3f085d38572c2ea8edbd5150172 ] Function gfs2_clear_rgrpd calls kfree(rgd->rd_bits) before calling return_all_reservations, but return_all_reservations still dereferences rgd->rd_bits in __rs_deltree. Fix that by moving the call to kfree below the call to return_all_reservations. Signed-off-by: Bob Peterson Signed-off-by: Andreas Gruenbacher Signed-off-by: Sasha Levin --- fs/gfs2/rgrp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c index c94c4ac1ae78b..1686a40099f21 100644 --- a/fs/gfs2/rgrp.c +++ b/fs/gfs2/rgrp.c @@ -739,9 +739,9 @@ void gfs2_clear_rgrpd(struct gfs2_sbd *sdp) } gfs2_free_clones(rgd); + return_all_reservations(rgd); kfree(rgd->rd_bits); rgd->rd_bits = NULL; - return_all_reservations(rgd); kmem_cache_free(gfs2_rgrpd_cachep, rgd); } } -- 2.27.0