vhost-net: update used ring on backend change
On backend change, we flushed out outstanding skbs
but forgot to update the used ring, so that
done entries were left in the ubuf_info ring.
As a result we lose heads or complete incorrect ones,
crashing the guest or leaking memory.
Fix by updating the used ring.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 70ac604..248b250 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -711,8 +711,12 @@
mutex_unlock(&vq->mutex);
- if (oldubufs)
+ if (oldubufs) {
vhost_ubuf_put_and_wait(oldubufs);
+ mutex_lock(&vq->mutex);
+ vhost_zerocopy_signal_used(vq);
+ mutex_unlock(&vq->mutex);
+ }
if (oldsock) {
vhost_net_flush_vq(n, index);