From patchwork Tue Sep 1 15:09:52 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 310259 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=-13.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, 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 021EDC433E7 for ; Tue, 1 Sep 2020 16:55:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BA6B8207D3 for ; Tue, 1 Sep 2020 16:55:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598979320; bh=wWypa74ApxnbJrtT25Hj2RfEkG8HY3F1rSeh2fTUozo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Kzeth/78XD+N7gjfkn1IVFj40EFTOKg/YZGef/3xjTIVBaXJGT/o2cQqwfGSiRdRs 8nnp2QD47ebMd99cft1VZ0YLqJHq645qE86U6Eh7Z0t/l04rFXH0YNoUPx6DbH7a6B 1eDxt1tAwuu4d1Wguw0brLunmcaBPhK25urzp2XA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729933AbgIAPYC (ORCPT ); Tue, 1 Sep 2020 11:24:02 -0400 Received: from mail.kernel.org ([198.145.29.99]:47532 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729877AbgIAPX7 (ORCPT ); Tue, 1 Sep 2020 11:23:59 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 16CF62078B; Tue, 1 Sep 2020 15:23:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598973839; bh=wWypa74ApxnbJrtT25Hj2RfEkG8HY3F1rSeh2fTUozo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dF939gj1QrR1xUKiBqf5M+iDi/yFkOB8bFVJRqtP1Mzvby26kngKd7yLYzei+imle 7k/cAfWkJXYA9jlJ9mm8u7WU72sFVNTbE4IDjN1O/1xuT/Nk76hqGzwODOaNSV3DRn dw7H5GCC+TnrwbZDSx237M11oBuazcLLp0zcxucs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Li Guifu , Chao Yu , Jaegeuk Kim , Sasha Levin Subject: [PATCH 4.19 037/125] f2fs: fix use-after-free issue Date: Tue, 1 Sep 2020 17:09:52 +0200 Message-Id: <20200901150936.376893944@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200901150934.576210879@linuxfoundation.org> References: <20200901150934.576210879@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@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 9782250c98156..161ce0eb8891a 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -1004,6 +1004,9 @@ 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 */ @@ -1067,8 +1070,6 @@ static void f2fs_put_super(struct super_block *sb) kfree(sbi->ckpt); - f2fs_unregister_sysfs(sbi); - sb->s_fs_info = NULL; if (sbi->s_chksum_driver) crypto_free_shash(sbi->s_chksum_driver);