From patchwork Sun Jun 28 06:49:23 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Keqian Zhu X-Patchwork-Id: 1318491 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=huawei.com 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 ozlabs.org (Postfix) with ESMTPS id 49vh8b1Pytz9sDX for ; Sun, 28 Jun 2020 16:50:37 +1000 (AEST) Received: from localhost ([::1]:56098 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jpR97-0006wV-Qq for incoming@patchwork.ozlabs.org; Sun, 28 Jun 2020 02:50:33 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:39498) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jpR8a-0006w4-PB; Sun, 28 Jun 2020 02:50:00 -0400 Received: from szxga04-in.huawei.com ([45.249.212.190]:3715 helo=huawei.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jpR8Y-0000oX-KP; Sun, 28 Jun 2020 02:50:00 -0400 Received: from DGGEMS414-HUB.china.huawei.com (unknown [172.30.72.59]) by Forcepoint Email with ESMTP id 235214851E26FC420DB6; Sun, 28 Jun 2020 14:49:43 +0800 (CST) Received: from DESKTOP-5IS4806.china.huawei.com (10.174.187.22) by DGGEMS414-HUB.china.huawei.com (10.3.19.214) with Microsoft SMTP Server id 14.3.487.0; Sun, 28 Jun 2020 14:49:33 +0800 From: Keqian Zhu To: , Subject: [PATCH] migration: Assign current_migration as NULL after migration Date: Sun, 28 Jun 2020 14:49:23 +0800 Message-ID: <20200628064923.13192-1-zhukeqian1@huawei.com> X-Mailer: git-send-email 2.8.4.windows.1 MIME-Version: 1.0 X-Originating-IP: [10.174.187.22] X-CFilter-Loop: Reflected Received-SPF: pass client-ip=45.249.212.190; envelope-from=zhukeqian1@huawei.com; helo=huawei.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/28 02:49:45 X-ACL-Warn: Detected OS = Linux 3.11 and newer [fuzzy] X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action 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: wanghaibin.wang@huawei.com, Keqian Zhu , "Dr . David Alan Gilbert" , Juan Quintela Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" In migration_shutdown, global var current_migration is freed but not assigned to NULL, which may cause heap-use-after-free problem if the following code logic is abnormal. Signed-off-by: Keqian Zhu --- migration/migration.c | 1 + 1 file changed, 1 insertion(+) diff --git a/migration/migration.c b/migration/migration.c index 481a590f72..effffd7332 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -189,6 +189,7 @@ void migration_shutdown(void) */ migrate_fd_cancel(current_migration); object_unref(OBJECT(current_migration)); + current_migration = NULL; } /* For outgoing */