media: uvcvideo: Add sanity check to uvc_ioctl_xu_ctrl_map

Do not process unknown data types.

Tested-by: Yunke Cao <[e-mail]>
Reviewed-by: Hans de Goede <[e-mail]>
Signed-off-by: Ricardo Ribalda <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Hans de Goede <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>

drivers/media/usb/uvc/uvc_v4l2.c

···
 	struct uvc_control_mapping *map;
 	int ret;
 
+	if (xmap->data_type > UVC_CTRL_DATA_TYPE_BITMASK) {
+		uvc_dbg(chain->dev, CONTROL,
+			"Unsupported UVC data type %u\n", xmap->data_type);
+		return -EINVAL;
+	}
+
 	map = kzalloc(sizeof(*map), GFP_KERNEL);
 	if (map == NULL)
 		return -ENOMEM;