void usb_destroy_configuration(struct usb_device *dev)
{
	int c, i;

	if (!dev->config)
		return;

	if (dev->rawdescriptors) {
		for (i = 0; i < dev->descriptor.bNumConfigurations; i++)
			kfree(dev->rawdescriptors[i]);

		kfree(dev->rawdescriptors);
		dev->rawdescriptors = NULL;
	}

	for (c = 0; c < dev->descriptor.bNumConfigurations; c++) {
		struct usb_host_config *cf = &dev->config[c];

		kfree(cf->string);
		for (i = 0; i < cf->desc.bNumInterfaces; i++) {
			if (cf->intf_cache[i])
				kref_put(&cf->intf_cache[i]->ref,
					  usb_release_interface_cache);
		}
	}
	kfree(dev->config);
	dev->config = NULL;
}

The product reads data past the end, or before the beginning, of the intended buffer.