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=-10.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,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 2E7ECC43387 for ; Mon, 7 Jan 2019 12:38:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F2B8A217D4 for ; Mon, 7 Jan 2019 12:38:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1546864724; bh=sv5P3HjAuvncJWTfzt4J0toVWdky/ogW/gvgnCm3SMk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=SG9hpnOiYMAct//2G3kJpCqNBWxfNjh2mktN/EcrJj6W2eZzdkRonc337Xkt1G79A 1hsbbHvpz+QdFmZE4jjQ6idTXrJ3L9pnsL2aWSkQcW+T7EZgM6NtLgj1RvZfmKjCzN D7VhpiCSErdsztitEoimCR2/hQzfxCOscqUb9XV0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727971AbfAGMin (ORCPT ); Mon, 7 Jan 2019 07:38:43 -0500 Received: from mail.kernel.org ([198.145.29.99]:53830 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727318AbfAGMil (ORCPT ); Mon, 7 Jan 2019 07:38:41 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (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 5B6A720859; Mon, 7 Jan 2019 12:38:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1546864720; bh=sv5P3HjAuvncJWTfzt4J0toVWdky/ogW/gvgnCm3SMk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=spCAe7/3JF0CocLcqZqtz40nj0gdlv5b8CpyoO9nMhYNcZyjs5kBnwi0/XC5JrmZC EEnaNGA+DcEHhjsCl4+DhkKWPdXjiTs3zxK+PCB34gZ4g3D9TYBAnIX3tO9aKPmgla 78HHUA/vdfYOYIzx+td4V4tk1sk8/dgvTsCm2Buc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jan Kara , Pan Bian , Theodore Tso , stable@kernel.org Subject: [PATCH 4.20 073/145] ext4: fix possible use after free in ext4_quota_enable Date: Mon, 7 Jan 2019 13:31:50 +0100 Message-Id: <20190107104446.846036201@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190107104437.308206189@linuxfoundation.org> References: <20190107104437.308206189@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.20-stable review patch. If anyone has any objections, please let me know. ------------------ From: Pan Bian commit 61157b24e60fb3cd1f85f2c76a7b1d628f970144 upstream. The function frees qf_inode via iput but then pass qf_inode to lockdep_set_quota_inode on the failure path. This may result in a use-after-free bug. The patch frees df_inode only when it is never used. Fixes: daf647d2dd5 ("ext4: add lockdep annotations for i_data_sem") Cc: stable@kernel.org # 4.6 Reviewed-by: Jan Kara Signed-off-by: Pan Bian Signed-off-by: Theodore Ts'o Signed-off-by: Greg Kroah-Hartman --- fs/ext4/super.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -5713,9 +5713,9 @@ static int ext4_quota_enable(struct supe qf_inode->i_flags |= S_NOQUOTA; lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA); err = dquot_enable(qf_inode, type, format_id, flags); - iput(qf_inode); if (err) lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL); + iput(qf_inode); return err; }