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 E69A5C433DF for ; Fri, 21 Aug 2020 17:25:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C013920748 for ; Fri, 21 Aug 2020 17:25:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598030719; bh=4P0E1TdwEUvHFMgvNrSm/DXS5S0ovHvkEWD5HGQ/MOA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=BiIOAkOpd5WBValfkzYDGvM44JtGIW89JKYU20v96vKZeWZ+19PWCoBx/+Uqfz2vP TiCFKPptle9CmrqpcCjMsB35rTZZ6Z5bfupilKlFOn1nHtM8Dhz9F/s0LK9mDie+yu ak1HkTTlgn9VA6q0yF1N8AFBRQYO/6dYp1tc/HsA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729181AbgHURZS (ORCPT ); Fri, 21 Aug 2020 13:25:18 -0400 Received: from mail.kernel.org ([198.145.29.99]:48060 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727902AbgHUQPY (ORCPT ); Fri, 21 Aug 2020 12:15:24 -0400 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 69E2C21741; Fri, 21 Aug 2020 16:15:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598026524; bh=4P0E1TdwEUvHFMgvNrSm/DXS5S0ovHvkEWD5HGQ/MOA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZZCJjL9Zj5J6cnTtuS7R5txtxAvHS2wjGPeb1SvKdU18XZgduni6tLj/MVWIDPAp2 Sx6YWE+KzqMGtKWbJLsOVobZAX/868WwDirgT1UbHFZkPeg/NFuKPrdzCx7ijhlSvP Y9AUMP6hcKGV245REWMBcDF98CFJlkxL+lHX9yPo= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Li Guifu , Chao Yu , Jaegeuk Kim , Sasha Levin , linux-f2fs-devel@lists.sourceforge.net Subject: [PATCH AUTOSEL 5.8 47/62] f2fs: fix use-after-free issue Date: Fri, 21 Aug 2020 12:14:08 -0400 Message-Id: <20200821161423.347071-47-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200821161423.347071-1-sashal@kernel.org> References: <20200821161423.347071-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Li Guifu [ Upstream commit 99c787cfd2bd04926f1f553b30bd7dcea2caaba1 ] During umount, f2fs_put_super() unregisters procfs entries after f2fs_destroy_segment_manager(), it may cause use-after-free issue when umount races with procfs accessing, fix it by relocating f2fs_unregister_sysfs(). [Chao Yu: change commit title/message a bit] Signed-off-by: Li Guifu Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim Signed-off-by: Sasha Levin --- fs/f2fs/super.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 20e56b0fa46a9..0deb839da0a03 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -1173,6 +1173,9 @@ static void f2fs_put_super(struct super_block *sb) int i; bool dropped; + /* unregister procfs/sysfs entries in advance to avoid race case */ + f2fs_unregister_sysfs(sbi); + f2fs_quota_off_umount(sb); /* prevent remaining shrinker jobs */ @@ -1238,8 +1241,6 @@ static void f2fs_put_super(struct super_block *sb) kvfree(sbi->ckpt); - f2fs_unregister_sysfs(sbi); - sb->s_fs_info = NULL; if (sbi->s_chksum_driver) crypto_free_shash(sbi->s_chksum_driver); -- 2.25.1