From patchwork Thu Dec 5 03:29:02 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pan Nengyuan X-Patchwork-Id: 11274109 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 38EF0930 for ; Thu, 5 Dec 2019 03:35:01 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 18A522073B for ; Thu, 5 Dec 2019 03:35:01 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 18A522073B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:49434 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ichut-0001im-NY for patchwork-qemu-devel@patchwork.kernel.org; Wed, 04 Dec 2019 22:34:59 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:46962) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ichsQ-0007Xj-1H for qemu-devel@nongnu.org; Wed, 04 Dec 2019 22:32:27 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ichsN-0005ez-Tw for qemu-devel@nongnu.org; Wed, 04 Dec 2019 22:32:25 -0500 Received: from szxga05-in.huawei.com ([45.249.212.191]:2275 helo=huawei.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1ichsH-0005Ug-Gs; Wed, 04 Dec 2019 22:32:19 -0500 Received: from DGGEMS409-HUB.china.huawei.com (unknown [172.30.72.58]) by Forcepoint Email with ESMTP id 0962F1780982CBE37420; Thu, 5 Dec 2019 11:32:08 +0800 (CST) Received: from HGHY2P002143101.china.huawei.com (10.184.39.213) by DGGEMS409-HUB.china.huawei.com (10.3.19.209) with Microsoft SMTP Server id 14.3.439.0; Thu, 5 Dec 2019 11:31:59 +0800 From: To: , , Subject: [PATCH v4 2/2] block/nbd: fix memory leak in nbd_open() Date: Thu, 5 Dec 2019 11:29:02 +0800 Message-ID: <1575516542-54640-3-git-send-email-pannengyuan@huawei.com> X-Mailer: git-send-email 2.7.2.windows.1 In-Reply-To: <1575516542-54640-1-git-send-email-pannengyuan@huawei.com> References: <1575516542-54640-1-git-send-email-pannengyuan@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.184.39.213] X-CFilter-Loop: Reflected X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 45.249.212.191 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: liyiting@huawei.com, Vladimir Sementsov-Ogievskiy , zhang.zhanghailiang@huawei.com, qemu-block@nongnu.org, Pan Nengyuan , qemu-devel@nongnu.org, qemu-stable , kuhn.chenqun@huawei.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" From: Pan Nengyuan In currently implementation there will be a memory leak when nbd_client_connect() returns error status. Here is an easy way to reproduce: 1. run qemu-iotests as follow and check the result with asan: ./check -raw 143 Following is the asan output backtrack: Direct leak of 40 byte(s) in 1 object(s) allocated from: #0 0x7f629688a560 in calloc (/usr/lib64/libasan.so.3+0xc7560) #1 0x7f6295e7e015 in g_malloc0 (/usr/lib64/libglib-2.0.so.0+0x50015) #2 0x56281dab4642 in qobject_input_start_struct /mnt/sdb/qemu-4.2.0-rc0/qapi/qobject-input-visitor.c:295 #3 0x56281dab1a04 in visit_start_struct /mnt/sdb/qemu-4.2.0-rc0/qapi/qapi-visit-core.c:49 #4 0x56281dad1827 in visit_type_SocketAddress qapi/qapi-visit-sockets.c:386 #5 0x56281da8062f in nbd_config /mnt/sdb/qemu-4.2.0-rc0/block/nbd.c:1716 #6 0x56281da8062f in nbd_process_options /mnt/sdb/qemu-4.2.0-rc0/block/nbd.c:1829 #7 0x56281da8062f in nbd_open /mnt/sdb/qemu-4.2.0-rc0/block/nbd.c:1873 Direct leak of 15 byte(s) in 1 object(s) allocated from: #0 0x7f629688a3a0 in malloc (/usr/lib64/libasan.so.3+0xc73a0) #1 0x7f6295e7dfbd in g_malloc (/usr/lib64/libglib-2.0.so.0+0x4ffbd) #2 0x7f6295e96ace in g_strdup (/usr/lib64/libglib-2.0.so.0+0x68ace) #3 0x56281da804ac in nbd_process_options /mnt/sdb/qemu-4.2.0-rc0/block/nbd.c:1834 #4 0x56281da804ac in nbd_open /mnt/sdb/qemu-4.2.0-rc0/block/nbd.c:1873 Indirect leak of 24 byte(s) in 1 object(s) allocated from: #0 0x7f629688a3a0 in malloc (/usr/lib64/libasan.so.3+0xc73a0) #1 0x7f6295e7dfbd in g_malloc (/usr/lib64/libglib-2.0.so.0+0x4ffbd) #2 0x7f6295e96ace in g_strdup (/usr/lib64/libglib-2.0.so.0+0x68ace) #3 0x56281dab41a3 in qobject_input_type_str_keyval /mnt/sdb/qemu-4.2.0-rc0/qapi/qobject-input-visitor.c:536 #4 0x56281dab2ee9 in visit_type_str /mnt/sdb/qemu-4.2.0-rc0/qapi/qapi-visit-core.c:297 #5 0x56281dad0fa1 in visit_type_UnixSocketAddress_members qapi/qapi-visit-sockets.c:141 #6 0x56281dad17b6 in visit_type_SocketAddress_members qapi/qapi-visit-sockets.c:366 #7 0x56281dad186a in visit_type_SocketAddress qapi/qapi-visit-sockets.c:393 #8 0x56281da8062f in nbd_config /mnt/sdb/qemu-4.2.0-rc0/block/nbd.c:1716 #9 0x56281da8062f in nbd_process_options /mnt/sdb/qemu-4.2.0-rc0/block/nbd.c:1829 #10 0x56281da8062f in nbd_open /mnt/sdb/qemu-4.2.0-rc0/block/nbd.c:1873 Fixes: 8f071c9db506e03ab Reported-by: Euler Robot Signed-off-by: Pan Nengyuan Reviewed-by: Vladimir Sementsov-Ogievskiy Cc: qemu-stable Cc: Vladimir Sementsov-Ogievskiy --- Changes v2 to v1: - add a new function to do the common cleanups (suggested by Stefano Garzarella). --- Changes v3 to v2: - split in two patches(suggested by Stefano Garzarella) --- Changes v4 to v3: - replace function name from nbd_free_bdrvstate_prop to nbd_clear_bdrvstate and add Fixes tag. --- block/nbd.c | 1 + 1 file changed, 1 insertion(+) diff --git a/block/nbd.c b/block/nbd.c index 8b4a65a..9062409 100644 --- a/block/nbd.c +++ b/block/nbd.c @@ -1891,6 +1891,7 @@ static int nbd_open(BlockDriverState *bs, QDict *options, int flags, ret = nbd_client_connect(bs, errp); if (ret < 0) { + nbd_clear_bdrvstate(s); return ret; } /* successfully connected */