From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([209.51.188.92]:43035) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hB47A-0003kn-7K for qemu-devel@nongnu.org; Mon, 01 Apr 2019 17:05:11 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hB477-00051D-Tj for qemu-devel@nongnu.org; Mon, 01 Apr 2019 17:05:08 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:42812 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 1hB477-0004oY-IG for qemu-devel@nongnu.org; Mon, 01 Apr 2019 17:05:05 -0400 Received: from pps.filterd (m0098420.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x31L4h3J183645 for ; Mon, 1 Apr 2019 17:04:50 -0400 Received: from e13.ny.us.ibm.com (e13.ny.us.ibm.com [129.33.205.203]) by mx0b-001b2d01.pphosted.com with ESMTP id 2rksyp8nqr-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Mon, 01 Apr 2019 17:04:45 -0400 Received: from localhost by e13.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 1 Apr 2019 22:02:38 +0100 From: Michael Roth Date: Mon, 1 Apr 2019 15:59:32 -0500 In-Reply-To: <20190401210011.16009-1-mdroth@linux.vnet.ibm.com> References: <20190401210011.16009-1-mdroth@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Message-Id: <20190401210011.16009-59-mdroth@linux.vnet.ibm.com> Content-Transfer-Encoding: quoted-printable Subject: [Qemu-devel] [PATCH 58/97] vhost-scsi: prevent using uninitialized vqs List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org, yuchenlin , Forrest Liu , "Michael S . Tsirkin" From: yuchenlin There are 3 virtqueues (ctrl, event and cmd) for virtio scsi device, but seabios will only set the physical address for the 3rd one (cmd). Then in vhost_virtqueue_start(), virtio_queue_get_desc_addr() will be 0 for ctrl and event vq. In this case, ctrl and event vq are not initialized. vhost_verify_ring_mappings may use uninitialized vhost_virtqueue such that vhost_verify_ring_part_mapping returns ENOMEM. When encountered this problem, we got the following logs: qemu-system-x86_64: Unable to map available ring for ring 0 qemu-system-x86_64: Verify ring failure on region 0 Signed-off-by: Forrest Liu Signed-off-by: yuchenlin Reviewed-by: Philippe Mathieu-Daud=C3=A9 Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin (cherry picked from commit e6cc11d64fc998c11a4dfcde8fda3fc33a74d844) Signed-off-by: Michael Roth --- hw/scsi/vhost-scsi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/scsi/vhost-scsi.c b/hw/scsi/vhost-scsi.c index 9c1bea8ff3..a5eb2800a2 100644 --- a/hw/scsi/vhost-scsi.c +++ b/hw/scsi/vhost-scsi.c @@ -183,7 +183,7 @@ static void vhost_scsi_realize(DeviceState *dev, Erro= r **errp) } =20 vsc->dev.nvqs =3D VHOST_SCSI_VQ_NUM_FIXED + vs->conf.num_queues; - vsc->dev.vqs =3D g_new(struct vhost_virtqueue, vsc->dev.nvqs); + vsc->dev.vqs =3D g_new0(struct vhost_virtqueue, vsc->dev.nvqs); vsc->dev.vq_index =3D 0; vsc->dev.backend_features =3D 0; =20 --=20 2.17.1