static int m88rs2000_frontend_attach(struct dvb_usb_adapter *adap)
{
	struct dvb_usb_device *d = adap->dev;
	struct dw2102_state *state = d->priv;

	mutex_lock(&d->data_mutex);

	state->data[0] = 0x51;

	if (dvb_usb_generic_rw(d, state->data, 1, state->data, 1, 0) < 0)
		err("command 0x51 transfer failed.");

	mutex_unlock(&d->data_mutex);

	adap->fe_adap[0].fe = dvb_attach(m88rs2000_attach,
					&s421_m88rs2000_config,
					&d->i2c_adap);

	if (adap->fe_adap[0].fe == NULL)
		return -EIO;

	if (dvb_attach(ts2020_attach, adap->fe_adap[0].fe,
				&dw2104_ts2020_config,
				&d->i2c_adap)) {
		info("Attached RS2000/TS2020!");
		return 0;
	}

	info("Failed to attach RS2000/TS2020!");
	return -EIO;
}
The software performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer.