static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
	int rv = -EINVAL;
	struct usb_host_interface *iface;
	struct usb_endpoint_descriptor *ep;
	struct usb_cdc_dmm_desc *dmhd;
	u8 *buffer = intf->altsetting->extra;
	int buflen = intf->altsetting->extralen;
	u16 maxcom = WDM_DEFAULT_BUFSIZE;

	if (!buffer)
		goto err;
	while (buflen > 2) {
		if (buffer[1] != USB_DT_CS_INTERFACE) {
			dev_err(&intf->dev, "skipping garbage\n");
			goto next_desc;
		}

		switch (buffer[2]) {
		case USB_CDC_HEADER_TYPE:
			break;
		case USB_CDC_DMM_TYPE:
			dmhd = (struct usb_cdc_dmm_desc *)buffer;
			maxcom = le16_to_cpu(dmhd->wMaxCommand);
			dev_dbg(&intf->dev,
				"Finding maximum buffer length: %d", maxcom);
			break;
		default:
			dev_err(&intf->dev,
				"Ignoring extra header, type %d, length %d\n",
				buffer[2], buffer[0]);
			break;
		}
next_desc:
		buflen -= buffer[0];
		buffer += buffer[0];
	}

	iface = intf->cur_altsetting;
	if (iface->desc.bNumEndpoints != 1)
		goto err;
	ep = &iface->endpoint[0].desc;

	rv = wdm_create(intf, ep, maxcom, &wdm_manage_power);

err:
	return rv;
}

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.