From patchwork Tue Aug 29 00:14:53 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Roth X-Patchwork-Id: 806893 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=2001:4830:134:3::11; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3xh9gh391Yz9sQl for ; Tue, 29 Aug 2017 11:16:00 +1000 (AEST) Received: from localhost ([::1]:42233 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dmV8H-0004OU-W4 for incoming@patchwork.ozlabs.org; Mon, 28 Aug 2017 21:15:58 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:49170) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dmUCz-0001xs-Jp for qemu-devel@nongnu.org; Mon, 28 Aug 2017 20:16:49 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dmUCw-0006M9-7q for qemu-devel@nongnu.org; Mon, 28 Aug 2017 20:16:45 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:58301 helo=mx0a-001b2d01.pphosted.com) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dmUCv-0006La-Va for qemu-devel@nongnu.org; Mon, 28 Aug 2017 20:16:42 -0400 Received: from pps.filterd (m0098420.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id v7T0E8nu099508 for ; Mon, 28 Aug 2017 20:16:41 -0400 Received: from e35.co.us.ibm.com (e35.co.us.ibm.com [32.97.110.153]) by mx0b-001b2d01.pphosted.com with ESMTP id 2cmr22ykt5-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Mon, 28 Aug 2017 20:16:41 -0400 Received: from localhost by e35.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 28 Aug 2017 18:16:40 -0600 Received: from b03cxnp08025.gho.boulder.ibm.com (9.17.130.17) by e35.co.us.ibm.com (192.168.1.135) with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted; Mon, 28 Aug 2017 18:16:39 -0600 Received: from b03ledav005.gho.boulder.ibm.com (b03ledav005.gho.boulder.ibm.com [9.17.130.236]) by b03cxnp08025.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v7T0GckB2752888; Mon, 28 Aug 2017 17:16:38 -0700 Received: from b03ledav005.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9C7B3BE040; Mon, 28 Aug 2017 18:16:38 -0600 (MDT) Received: from localhost (unknown [9.80.85.217]) by b03ledav005.gho.boulder.ibm.com (Postfix) with ESMTP id 687BFBE03A; Mon, 28 Aug 2017 18:16:38 -0600 (MDT) From: Michael Roth To: qemu-devel@nongnu.org Date: Mon, 28 Aug 2017 19:14:53 -0500 X-Mailer: git-send-email 2.7.4 In-Reply-To: <1503965694-10794-1-git-send-email-mdroth@linux.vnet.ibm.com> References: <1503965694-10794-1-git-send-email-mdroth@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 17082900-0012-0000-0000-000014ECDC63 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00007630; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000226; SDB=6.00909028; UDB=6.00455849; IPR=6.00689279; BA=6.00005557; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00016909; XFM=3.00000015; UTC=2017-08-29 00:16:40 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17082900-0013-0000-0000-00004F43FB7A Message-Id: <1503965694-10794-79-git-send-email-mdroth@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-08-28_13:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=3 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1707230000 definitions=main-1708290001 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 148.163.158.5 Subject: [Qemu-devel] [PATCH 78/79] block/nfs: fix mutex assertion in nfs_file_close() X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Jeff Cody , qemu-stable@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: Jeff Cody Commit c096358e747e88fc7364e40e3c354ee0bb683960 introduced assertion checks for when qemu_mutex() functions are called without the corresponding qemu_mutex_init() having initialized the mutex. This uncovered a latent bug in qemu's nfs driver - in nfs_client_close(), the NFSClient structure is overwritten with zeros, prior to the mutex being destroyed. Go ahead and destroy the mutex in nfs_client_close(), and change where we call qemu_mutex_init() so that it is correctly balanced. There are also a couple of memory leaks obscured by the memset, so this fixes those as well. Finally, we should be able to get rid of the memset(), as it isn't necessary. Cc: qemu-stable@nongnu.org Signed-off-by: Jeff Cody Reviewed-by: Peter Lieven Reviewed-by: Stefan Hajnoczi Reviewed-by: John Snow Signed-off-by: Kevin Wolf (cherry picked from commit 113fe792fd4931dd0538f03859278b8719ee4fa2) Signed-off-by: Michael Roth --- block/nfs.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/block/nfs.c b/block/nfs.c index 344186f..7e1bea1 100644 --- a/block/nfs.c +++ b/block/nfs.c @@ -434,19 +434,23 @@ static void nfs_client_close(NFSClient *client) if (client->context) { if (client->fh) { nfs_close(client->context, client->fh); + client->fh = NULL; } aio_set_fd_handler(client->aio_context, nfs_get_fd(client->context), false, NULL, NULL, NULL, NULL); nfs_destroy_context(client->context); + client->context = NULL; } - memset(client, 0, sizeof(NFSClient)); + g_free(client->path); + qemu_mutex_destroy(&client->mutex); + qapi_free_NFSServer(client->server); + client->server = NULL; } static void nfs_file_close(BlockDriverState *bs) { NFSClient *client = bs->opaque; nfs_client_close(client); - qemu_mutex_destroy(&client->mutex); } static NFSServer *nfs_config(QDict *options, Error **errp) @@ -499,6 +503,7 @@ static int64_t nfs_client_open(NFSClient *client, QDict *options, struct stat st; char *file = NULL, *strp = NULL; + qemu_mutex_init(&client->mutex); opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); qemu_opts_absorb_qdict(opts, options, &local_err); if (local_err) { @@ -661,7 +666,7 @@ static int nfs_file_open(BlockDriverState *bs, QDict *options, int flags, if (ret < 0) { return ret; } - qemu_mutex_init(&client->mutex); + bs->total_sectors = ret; ret = 0; return ret;