Commit c047e5f3 authored Jul 20, 2011 by Michael S. Tsirkin

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>

parent b834226b

drivers/vhost/net.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -711,8 +711,12 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd)

		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);