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[PULL,for-2.3,2/4] virtio-ccw: range check in READ_VQ_CONF

Message ID 1427702547-21261-3-git-send-email-cornelia.huck@de.ibm.com
State New
Headers show

Commit Message

Cornelia Huck March 30, 2015, 8:02 a.m. UTC 
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>
---
 hw/s390x/virtio-ccw.c | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
index ceb6a45..d32ecaf 100644
--- a/hw/s390x/virtio-ccw.c
+++ b/hw/s390x/virtio-ccw.c
@@ -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,