From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-1851310-1525116680-2-17595889196520338511 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.25, MAILING_LIST_MULTI -1, ME_NOAUTH 0.01, RCVD_IN_DNSWL_HI -5, LANGUAGES en, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='US', FromHeader='org', MailFrom='org' X-Spam-charsets: plain='UTF-8' X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: stable-owner@vger.kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=fm2; t= 1525116679; b=ON6hWfZOzXpVVt13fr+QO7kTncdRrPOeEj7lltWETWC2qCee/0 4okO26ZIj8sy7emUEcD3cYpOBOzwzfLrtDnqPWm9f/KCGqc1ZiOZYNykejYXnahX QJl+/C0oYqzT33OWFGUbPOhSHj4xDcO5eahYILLt66KARhW2uFlleCCr5YGjGpGu Kgx7QxBYOodfTKHRWNsvNpBXkKOgsqsoncmOSQkm5Y8Paa1ZypPUW45lEWLBiuAB 86+LQ0OWHFaH+H/UFccqalq/cTg/mkVylMohhXg1Ed9DPg2u90boid+vRcEU2/ix dU1IaUHlIpcMb0hYf6CZlWMmAuntYp6E+lkg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=from:to:cc:subject:date:message-id :in-reply-to:references:mime-version:content-type:sender :list-id; s=fm2; t=1525116679; bh=CyLa2c4x/vem9zLj0xjxE/IiSQSlTU 84I3Gwrfz95Gw=; b=eF5tilofDd6EaaufVEhSeND2urWrFACkO5dBIfElPPMiBR dyM3z7LwdxAczTXtDNubnAojV2RfqWSba32Pgtqd/Pc4GYZo8u2PKHOqE0iENXv+ lcyH82wyU2kbmFQqTNQ0/UcV3YB5T8Cc86Tuet/6XiUHUpXFC+fIAdYnEGjy4zhT 1kaUsGhjQlI8E6nJ8X/H1UoLosRPg7h6072mQwzkV0j5QMfoafMOM5cglKkA2w3I R1p1v9cUat3ZtEzlUP/ftc72v2Y43mR2wYJKP77+GgwOWRIyy75TwEvFWzQvXrO5 62SI9aBO8lz7Tms3TioG/xUEiW5q/jAOqqyvBv6A== ARC-Authentication-Results: i=1; mx2.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=linuxfoundation.org; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-cm=none score=0; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=linuxfoundation.org header.result=pass header_is_org_domain=yes; x-vs=clean score=-100 state=0 Authentication-Results: mx2.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=linuxfoundation.org; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-cm=none score=0; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=linuxfoundation.org header.result=pass header_is_org_domain=yes; x-vs=clean score=-100 state=0 X-ME-VSCategory: clean X-CM-Envelope: MS4wfBAVnXE92iSKrlk2SXUADzi5lLAhxyRJpdSD3yee2JmCF3pby5tdcaYFHLg/4Xk73wFAU/GpUjPxqx6QNJ+pad3jzJzJu+9tnrg8kTlk0493CVD+Asgu F6IubuAChjswJk7JOnuaY4J5NjAKFt3LiAFgj3JRmBSvfF5xDw7F1rrutZD23lSmGcl4r9S7xQmujJIKSfiT+ggPlJZHQIVaPKvyEKJ2ltuP7RguWnUNj9AH X-CM-Analysis: v=2.3 cv=E8HjW5Vl c=1 sm=1 tr=0 a=UK1r566ZdBxH71SXbqIOeA==:117 a=UK1r566ZdBxH71SXbqIOeA==:17 a=IkcTkHD0fZMA:10 a=Kd1tUaAdevIA:10 a=VwQbUJbxAAAA:8 a=RPJ6JBhKAAAA:8 a=ag1SF4gXAAAA:8 a=1LLt1D0RfLeyhq938B4A:9 a=QEXdDO2ut3YA:10 a=AjGcO6oz07-iQ99wixmX:22 a=fa_un-3J20JGBB2Tu-mn:22 a=Yupwre4RP9_Eg_Bd0iYG:22 X-ME-CMScore: 0 X-ME-CMCategory: none Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755679AbeD3TbD (ORCPT ); Mon, 30 Apr 2018 15:31:03 -0400 Received: from mail.kernel.org ([198.145.29.99]:38202 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756482AbeD3TaW (ORCPT ); Mon, 30 Apr 2018 15:30:22 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C3B3422DAC Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=fail smtp.mailfrom=gregkh@linuxfoundation.org From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Theodore Tso , Andreas Dilger , Jan Kara Subject: [PATCH 4.14 02/91] ext4: set h_journal if there is a failure starting a reserved handle Date: Mon, 30 Apr 2018 12:23:44 -0700 Message-Id: <20180430184004.346695281@linuxfoundation.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180430184004.216234025@linuxfoundation.org> References: <20180430184004.216234025@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Theodore Ts'o commit b2569260d55228b617bd82aba6d0db2faeeb4116 upstream. If ext4 tries to start a reserved handle via jbd2_journal_start_reserved(), and the journal has been aborted, this can result in a NULL pointer dereference. This is because the fields h_journal and h_transaction in the handle structure share the same memory, via a union, so jbd2_journal_start_reserved() will clear h_journal before calling start_this_handle(). If this function fails due to an aborted handle, h_journal will still be NULL, and the call to jbd2_journal_free_reserved() will pass a NULL journal to sub_reserve_credits(). This can be reproduced by running "kvm-xfstests -c dioread_nolock generic/475". Cc: stable@kernel.org # 3.11 Fixes: 8f7d89f36829b ("jbd2: transaction reservation support") Signed-off-by: Theodore Ts'o Reviewed-by: Andreas Dilger Reviewed-by: Jan Kara Signed-off-by: Greg Kroah-Hartman --- fs/jbd2/transaction.c | 1 + 1 file changed, 1 insertion(+) --- a/fs/jbd2/transaction.c +++ b/fs/jbd2/transaction.c @@ -535,6 +535,7 @@ int jbd2_journal_start_reserved(handle_t */ ret = start_this_handle(journal, handle, GFP_NOFS); if (ret < 0) { + handle->h_journal = journal; jbd2_journal_free_reserved(handle); return ret; }