From patchwork Thu Mar 24 17:56:51 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 8663531 Return-Path: X-Original-To: patchwork-qemu-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id A9BD59F36E for ; Thu, 24 Mar 2016 17:57:31 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 1CBF4200B4 for ; Thu, 24 Mar 2016 17:57:31 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 68F6F2038E for ; Thu, 24 Mar 2016 17:57:30 +0000 (UTC) Received: from localhost ([::1]:52112 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aj9Vh-00075c-T7 for patchwork-qemu-devel@patchwork.kernel.org; Thu, 24 Mar 2016 13:57:29 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51635) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aj9VM-0006u2-HX for qemu-devel@nongnu.org; Thu, 24 Mar 2016 13:57:13 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aj9VL-0003SP-Gm for qemu-devel@nongnu.org; Thu, 24 Mar 2016 13:57:08 -0400 Received: from mx1.redhat.com ([209.132.183.28]:41871) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aj9VL-0003S4-Bc for qemu-devel@nongnu.org; Thu, 24 Mar 2016 13:57:07 -0400 Received: from int-mx13.intmail.prod.int.phx2.redhat.com (int-mx13.intmail.prod.int.phx2.redhat.com [10.5.11.26]) by mx1.redhat.com (Postfix) with ESMTPS id E6B4C711C6 for ; Thu, 24 Mar 2016 17:57:06 +0000 (UTC) Received: from localhost (ovpn-112-44.ams2.redhat.com [10.36.112.44]) by int-mx13.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u2OHv5mF030154; Thu, 24 Mar 2016 13:57:06 -0400 From: Stefan Hajnoczi To: qemu-devel@nongnu.org Date: Thu, 24 Mar 2016 17:56:51 +0000 Message-Id: <1458842214-11450-5-git-send-email-stefanha@redhat.com> In-Reply-To: <1458842214-11450-1-git-send-email-stefanha@redhat.com> References: <1458842214-11450-1-git-send-email-stefanha@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.26 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Thu, 24 Mar 2016 17:57:06 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Cc: Fam Zheng , Stefan Hajnoczi , "Michael S. Tsirkin" Subject: [Qemu-devel] [RFC 4/7] virtio: handle virtqueue_get_avail_bytes() errors X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP If the vring is invalid, tell the caller no bytes are available and mark the device broken. Signed-off-by: Stefan Hajnoczi --- hw/virtio/virtio.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index 86352c8..4758fe3 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -399,14 +399,14 @@ void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes, if (desc.flags & VRING_DESC_F_INDIRECT) { if (desc.len % sizeof(VRingDesc)) { - error_report("Invalid size for indirect buffer table"); - exit(1); + virtio_error(vdev, "Invalid size for indirect buffer table"); + goto err; } /* If we've got too many, that implies a descriptor loop. */ if (num_bufs >= max) { - error_report("Looped descriptor"); - exit(1); + virtio_error(vdev, "Looped descriptor"); + goto err; } /* loop over the indirect descriptor table */ @@ -420,8 +420,8 @@ void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes, do { /* If we've got too many, that implies a descriptor loop. */ if (++num_bufs > max) { - error_report("Looped descriptor"); - exit(1); + virtio_error(vdev, "Looped descriptor"); + goto err; } if (desc.flags & VRING_DESC_F_WRITE) { @@ -446,6 +446,11 @@ done: if (out_bytes) { *out_bytes = out_total; } + return; + +err: + in_total = out_total = 0; + goto done; } int virtqueue_avail_bytes(VirtQueue *vq, unsigned int in_bytes,