static int cxusb_dualdig4_frontend_attach(struct dvb_usb_adapter *adap)
{
	u8 ircode[4];
	int i;
	struct i2c_msg msg = { .addr = 0x6b, .flags = I2C_M_RD,
			       .buf = ircode, .len = 4 };

	if (usb_set_interface(adap->dev->udev, 0, 1) < 0)
		err("set interface failed");

	cxusb_ctrl_msg(adap->dev, CMD_DIGITAL, NULL, 0, NULL, 0);

	/* reset the tuner and demodulator */
	cxusb_bluebird_gpio_rw(adap->dev, 0x04, 0);
	cxusb_bluebird_gpio_pulse(adap->dev, 0x01, 1);
	cxusb_bluebird_gpio_pulse(adap->dev, 0x02, 1);

	adap->fe_adap[0].fe =
		dvb_attach(zl10353_attach,
			   &cxusb_zl10353_xc3028_config_no_i2c_gate,
			   &adap->dev->i2c_adap);
	if ((adap->fe_adap[0].fe) == NULL)
		return -EIO;

	/* try to determine if there is no IR decoder on the I2C bus */
	for (i = 0; adap->dev->props.rc.core.rc_codes && i < 5; i++) {
		msleep(20);
		if (cxusb_i2c_xfer(&adap->dev->i2c_adap, &msg, 1) != 1)
			goto no_IR;
		if (ircode[0] == 0 && ircode[1] == 0)
			continue;
		if (ircode[2] + ircode[3] != 0xff) {
no_IR:
			adap->dev->props.rc.core.rc_codes = NULL;
			info("No IR receiver detected on this device.");
			break;
		}
	}

	return 0;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.