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virtio-ccw: range check in READ_VQ_CONF

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Processing for READ_VQ_CONF needs to check whether the requested queue
value is actually in the supported range and post a channel program
check if not.

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 13:16:20 +01:00
parent 590fe5722b
commit d03a363054
1 changed files with 4 additions and 0 deletions
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4
hw/s390x/virtio-ccw.c
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@ -549,6 +549,10 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
ret = -EFAULT;
} else {
vq_config.index = lduw_be_phys(&address_space_memory, ccw.cda);
if (vq_config.index >= VIRTIO_PCI_QUEUE_MAX) {
ret = -EINVAL;
break;
}
vq_config.num_max = virtio_queue_get_num(vdev,
vq_config.index);
stw_be_phys(&address_space_memory,