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virtio-ccw: fix range check for SET_VQ

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VIRTIO_PCI_QUEUE_MAX is already too big; a malicious guest would be
able to trigger a write beyond the VirtQueue structure.

Cc: qemu-stable@nongnu.org
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Cornelia Huck 2015-03-20 13:08:36 +01:00
parent 627f91b1f8
commit 590fe5722b
1 changed files with 1 additions and 1 deletions
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2
hw/s390x/virtio-ccw.c
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@ -266,7 +266,7 @@ static int virtio_ccw_set_vqs(SubchDev *sch, uint64_t addr, uint32_t align,
{ {
VirtIODevice *vdev = virtio_ccw_get_vdev(sch); VirtIODevice *vdev = virtio_ccw_get_vdev(sch);
if (index > VIRTIO_PCI_QUEUE_MAX) { if (index >= VIRTIO_PCI_QUEUE_MAX) {
return -EINVAL; return -EINVAL;
} }