[Qemu-devel] [PATCH] virtio-rng: add check of period

[Amos Kong <akong@redhat.com>]

If period is assigned to 0, limit timer will expire immediately.
This limit is meaningless. This patch forbids to assign 0 to
period.

Signed-off-by: Amos Kong <akong@redhat.com>
---
 hw/virtio/virtio-rng.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/hw/virtio/virtio-rng.c b/hw/virtio/virtio-rng.c
index 314e393..b22ccf1 100644
--- a/hw/virtio/virtio-rng.c
+++ b/hw/virtio/virtio-rng.c
@@ -139,6 +139,12 @@ static int virtio_rng_device_init(VirtIODevice *vdev)
     VirtIORNG *vrng = VIRTIO_RNG(vdev);
     Error *local_err = NULL;
 
+    if (!vrng->conf.period_ms > 0) {
+        qerror_report(QERR_INVALID_PARAMETER_VALUE, "period",
+                      "a positive number");
+        return -1;
+    }
+
     if (vrng->conf.rng == NULL) {
         vrng->conf.default_backend = RNG_RANDOM(object_new(TYPE_RNG_RANDOM));
 
-- 
1.8.3.1