virtio_net: stricter short buffer length checks
Our buffer length check is not strict enough for mergeable buffers: buffer can still be shorter that header + address by 2 bytes. Fix that up. Signed-off-by: NMichael S. Tsirkin <mst@redhat.com> Reviewed-by: NCornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: NJason Wang <jasowang@redhat.com>
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