From nobody Fri Dec 19 06:30:52 2025 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 1495507745867438.15035316570015; Mon, 22 May 2017 19:49:05 -0700 (PDT) Received: from localhost ([::1]:45781 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dCzse-0008Fa-JQ for importer@patchew.org; Mon, 22 May 2017 22:49:04 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:49980) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dCzo7-0004rW-Jz for qemu-devel@nongnu.org; Mon, 22 May 2017 22:44:26 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dCzo6-0005Ia-KH for qemu-devel@nongnu.org; Mon, 22 May 2017 22:44:23 -0400 Received: from mx1.redhat.com ([209.132.183.28]:38262) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dCzo6-0005IE-Dm; Mon, 22 May 2017 22:44:22 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 267BE80476; Tue, 23 May 2017 02:44:21 +0000 (UTC) Received: from jason-ThinkPad-T450s.redhat.com (ovpn-12-19.pek2.redhat.com [10.72.12.19]) by smtp.corp.redhat.com (Postfix) with ESMTP id 81F8178125; Tue, 23 May 2017 02:44:15 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 267BE80476 Authentication-Results: ext-mx04.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx04.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=jasowang@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com 267BE80476 From: Jason Wang To: qemu-devel@nongnu.org, peter.maydell@linaro.org Date: Tue, 23 May 2017 10:43:53 +0800 Message-Id: <1495507439-1784-4-git-send-email-jasowang@redhat.com> In-Reply-To: <1495507439-1784-1-git-send-email-jasowang@redhat.com> References: <1495507439-1784-1-git-send-email-jasowang@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.28]); Tue, 23 May 2017 02:44:21 +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] [PULL 3/9] virtio-net: fix wild pointer when remove virtio-net queues 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: Jason Wang , Yunjian Wang , qemu-stable@nongnu.org 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" From: Yunjian Wang The tx_bh or tx_timer will free in virtio_net_del_queue() function, when removing virtio-net queues if the guest doesn't support multiqueue. But it might be still referenced by virtio_net_set_status(), which needs to be set NULL. And also the tx_waiting needs to be set zero to prevent virtio_net_set_status() accessing tx_bh or tx_timer. Cc: qemu-stable@nongnu.org Signed-off-by: Yunjian Wang Signed-off-by: Jason Wang --- hw/net/virtio-net.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c index 7d091c9..98bd683 100644 --- a/hw/net/virtio-net.c +++ b/hw/net/virtio-net.c @@ -1522,9 +1522,12 @@ static void virtio_net_del_queue(VirtIONet *n, int i= ndex) if (q->tx_timer) { timer_del(q->tx_timer); timer_free(q->tx_timer); + q->tx_timer =3D NULL; } else { qemu_bh_delete(q->tx_bh); + q->tx_bh =3D NULL; } + q->tx_waiting =3D 0; virtio_del_queue(vdev, index * 2 + 1); } =20 --=20 2.7.4