int usb_get_descriptor(struct usb_device *dev, unsigned char type,
		       unsigned char index, void *buf, int size)
{
	int i;
	int result;

	memset(buf, 0, size);	/* Make sure we parse really received data */

	for (i = 0; i < 3; ++i) {
		/* retry on length 0 or error; some devices are flakey */
		result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
				USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
				(type << 8) + index, 0, buf, size,
				USB_CTRL_GET_TIMEOUT);
		if (result <= 0 && result != -ETIMEDOUT)
			continue;
		if (result > 1 && ((u8 *)buf)[1] != type) {
			result = -ENODATA;
			continue;
		}
		break;
	}
	return result;
}

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.