[Qemu-devel] [PULL 35/57] virtio-ccw: validate the number of queues against bus limitation

[Michael S. Tsirkin]

From: Jason Wang <address@hidden>

Cc: Cornelia Huck <address@hidden>
Cc: Christian Borntraeger <address@hidden>
Cc: Richard Henderson <address@hidden>
Cc: Alexander Graf <address@hidden>
Signed-off-by: Jason Wang <address@hidden>
Reviewed-by: Michael S. Tsirkin <address@hidden>
Signed-off-by: Michael S. Tsirkin <address@hidden>
---
 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 60d60d6..ef90fed 100644
--- a/hw/s390x/virtio-ccw.c
+++ b/hw/s390x/virtio-ccw.c
@@ -1381,7 +1381,16 @@ 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);
 
-- 
MST