From nobody Thu May 2 07:16:19 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1496134852244968.0587428942939; Tue, 30 May 2017 02:00:52 -0700 (PDT) Received: from localhost ([::1]:52356 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dFd1F-0004km-29 for importer@patchew.org; Tue, 30 May 2017 05:00:49 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:60321) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dFd0P-0004HC-BL for qemu-devel@nongnu.org; Tue, 30 May 2017 04:59:58 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dFd0K-0003qu-Ie for qemu-devel@nongnu.org; Tue, 30 May 2017 04:59:57 -0400 Received: from mx1.redhat.com ([209.132.183.28]:59380) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dFd0K-0003qb-CQ; Tue, 30 May 2017 04:59:52 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 5ED344E357; Tue, 30 May 2017 08:59:50 +0000 (UTC) Received: from dhcp-1-107.brq.redhat.com (dhcp-1-114.brq.redhat.com [10.34.1.114]) by smtp.corp.redhat.com (Postfix) with ESMTP id B62D45C3FA; Tue, 30 May 2017 08:59:45 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 5ED344E357 Authentication-Results: ext-mx09.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx09.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=lprosek@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com 5ED344E357 From: Ladi Prosek To: qemu-devel@nongnu.org Date: Tue, 30 May 2017 10:59:43 +0200 Message-Id: <20170530085943.18141-1-lprosek@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Tue, 30 May 2017 08:59:50 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH] virtio-serial-bus: Unset hotplug handler when unrealize 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: pbonzini@redhat.com, famz@redhat.com, qemu-stable@nongnu.org, mst@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Virtio serial device controls the lifetime of virtio-serial-bus and virtio-serial-bus links back to the device via its hotplug-handler property. This extra ref-count prevents the device from getting finalized, leaving the VirtIODevice memory listener registered and leading to use-after-free later on. This patch addresses the same issue as Fam Zheng's "virtio-scsi: Unset hotplug handler when unrealize" only for a different virtio device. Cc: qemu-stable@nongnu.org Signed-off-by: Ladi Prosek Reviewed-by: Fam Zheng Reviewed-by: Paolo Bonzini --- hw/char/virtio-serial-bus.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/hw/char/virtio-serial-bus.c b/hw/char/virtio-serial-bus.c index d797a67..aa9c11a 100644 --- a/hw/char/virtio-serial-bus.c +++ b/hw/char/virtio-serial-bus.c @@ -1121,6 +1121,9 @@ static void virtio_serial_device_unrealize(DeviceStat= e *dev, Error **errp) timer_free(vser->post_load->timer); g_free(vser->post_load); } + + qbus_set_hotplug_handler(BUS(&vser->bus), NULL, errp); + virtio_cleanup(vdev); } =20 --=20 2.9.3