static int picolcd_check_version(struct hid_device *hdev)
{
	struct picolcd_data *data = hid_get_drvdata(hdev);
	struct picolcd_pending *verinfo;
	int ret = 0;

	if (!data)
		return -ENODEV;

	verinfo = picolcd_send_and_wait(hdev, REPORT_VERSION, NULL, 0);
	if (!verinfo) {
		hid_err(hdev, "no version response from PicoLCD\n");
		return -ENODEV;
	}

	if (verinfo->raw_size == 2) {
		data->version[0] = verinfo->raw_data[1];
		data->version[1] = verinfo->raw_data[0];
		if (data->status & PICOLCD_BOOTLOADER) {
			hid_info(hdev, "PicoLCD, bootloader version %d.%d\n",
				 verinfo->raw_data[1], verinfo->raw_data[0]);
		} else {
			hid_info(hdev, "PicoLCD, firmware version %d.%d\n",
				 verinfo->raw_data[1], verinfo->raw_data[0]);
		}
	} else {
		hid_err(hdev, "confused, got unexpected version response from PicoLCD\n");
		ret = -EINVAL;
	}
	kfree(verinfo);
	return ret;
}

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.