[Qemu-devel] [PATCH master/0.14] virtio-serial: Make sure virtqueue is ready before discarding data

[Amit Shah]

This can happen if a port gets unplugged before guest has chance to
initialise vqs.

Reported-by: Juan Quintela <address@hidden>
Signed-off-by: Amit Shah <address@hidden>
---
 hw/virtio-serial-bus.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/hw/virtio-serial-bus.c b/hw/virtio-serial-bus.c
index 09e22aa..e05ab5e 100644
--- a/hw/virtio-serial-bus.c
+++ b/hw/virtio-serial-bus.c
@@ -117,6 +117,9 @@ static void discard_vq_data(VirtQueue *vq, VirtIODevice 
*vdev)
 {
     VirtQueueElement elem;
 
+    if (!virtio_queue_ready(vq)) {
+        return;
+    }
     while (virtqueue_pop(vq, &elem)) {
         virtqueue_push(vq, &elem, 0);
     }
-- 
1.7.3.5