69 lines
2.2 KiB
Diff
69 lines
2.2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: Prasad J Pandit <pjp@fedoraproject.org>
|
|
Date: Wed, 29 Nov 2017 23:14:27 +0530
|
|
Subject: [PATCH] virtio: check VirtQueue Vring object is set
|
|
|
|
A guest could attempt to use an uninitialised VirtQueue object
|
|
or unset Vring.align leading to a arithmetic exception. Add check
|
|
to avoid it.
|
|
|
|
Reported-by: Zhangboxian <zhangboxian@huawei.com>
|
|
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
|
|
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
|
|
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
|
|
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
|
|
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
|
|
---
|
|
hw/virtio/virtio.c | 14 +++++++++++---
|
|
1 file changed, 11 insertions(+), 3 deletions(-)
|
|
|
|
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
|
|
index 33bb770177..76b9a9907c 100644
|
|
--- a/hw/virtio/virtio.c
|
|
+++ b/hw/virtio/virtio.c
|
|
@@ -183,7 +183,7 @@ void virtio_queue_update_rings(VirtIODevice *vdev, int n)
|
|
{
|
|
VRing *vring = &vdev->vq[n].vring;
|
|
|
|
- if (!vring->desc) {
|
|
+ if (!vring->num || !vring->desc || !vring->align) {
|
|
/* not yet setup -> nothing to do */
|
|
return;
|
|
}
|
|
@@ -1416,6 +1416,9 @@ void virtio_config_modern_writel(VirtIODevice *vdev,
|
|
|
|
void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr)
|
|
{
|
|
+ if (!vdev->vq[n].vring.num) {
|
|
+ return;
|
|
+ }
|
|
vdev->vq[n].vring.desc = addr;
|
|
virtio_queue_update_rings(vdev, n);
|
|
}
|
|
@@ -1428,6 +1431,9 @@ hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n)
|
|
void virtio_queue_set_rings(VirtIODevice *vdev, int n, hwaddr desc,
|
|
hwaddr avail, hwaddr used)
|
|
{
|
|
+ if (!vdev->vq[n].vring.num) {
|
|
+ return;
|
|
+ }
|
|
vdev->vq[n].vring.desc = desc;
|
|
vdev->vq[n].vring.avail = avail;
|
|
vdev->vq[n].vring.used = used;
|
|
@@ -1496,8 +1502,10 @@ void virtio_queue_set_align(VirtIODevice *vdev, int n, int align)
|
|
*/
|
|
assert(k->has_variable_vring_alignment);
|
|
|
|
- vdev->vq[n].vring.align = align;
|
|
- virtio_queue_update_rings(vdev, n);
|
|
+ if (align) {
|
|
+ vdev->vq[n].vring.align = align;
|
|
+ virtio_queue_update_rings(vdev, n);
|
|
+ }
|
|
}
|
|
|
|
static bool virtio_queue_notify_aio_vq(VirtQueue *vq)
|
|
--
|
|
2.11.0
|
|
|