[Qemu-devel] [PATCH V8 5/9] virtio-ccw: validate the number of queues against bus limitation

[Jason Wang <jasowang@redhat.com>]

Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Alexander Graf <agraf@suse.de>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/s390x/virtio-ccw.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
index aaa9833..18fc697 100644
--- a/hw/s390x/virtio-ccw.c
+++ b/hw/s390x/virtio-ccw.c
@@ -1416,7 +1416,16 @@ static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f)
 static void virtio_ccw_device_plugged(DeviceState *d, Error **errp)
 {
     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
+    VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
     SubchDev *sch = dev->sch;
+    int n = virtio_get_num_queues(vdev);
+
+    if (virtio_get_num_queues(vdev) > VIRTIO_CCW_QUEUE_MAX) {
+        error_setg(errp, "The nubmer of virtqueues %d "
+                   "exceeds ccw limit %d", n,
+                   VIRTIO_CCW_QUEUE_MAX);
+        return;
+    }
 
     sch->id.cu_model = virtio_bus_get_vdev_id(&dev->bus);
 
-- 
2.1.4