static struct port_buffer *get_inbuf(struct port *port)
{
	struct port_buffer *buf;
	unsigned int len;

	if (port->inbuf)
		return port->inbuf;

	buf = virtqueue_get_buf(port->in_vq, &len);
	if (buf) {
		buf->len = min_t(size_t, len, buf->size);
		buf->offset = 0;
		port->stats.bytes_received += len;
	}
	return buf;
}
The program copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow.