we only need to allocate enough memory to hold the packet. This might be
less than NET_BUFSIZE. Additionally fail early if the packet is larger
than NET_BUFSIZE.
Signed-off-by: Peter Lieven <pl@kamp.de>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>