int drm_mode_getblob_ioctl(struct drm_device *dev,
			   void *data, struct drm_file *file_priv)
{
	struct drm_mode_object *obj;
	struct drm_mode_get_blob *out_resp = data;
	struct drm_property_blob *blob;
	int ret = 0;
	void *blob_ptr;

	if (!drm_core_check_feature(dev, DRIVER_MODESET))
		return -EINVAL;

	mutex_lock(&dev->mode_config.mutex);
	obj = drm_mode_object_find(dev, out_resp->blob_id, DRM_MODE_OBJECT_BLOB);
	if (!obj) {
		ret = -EINVAL;
		goto done;
	}
	blob = obj_to_blob(obj);

	if (out_resp->length == blob->length) {
		blob_ptr = (void *)(unsigned long)out_resp->data;
		if (copy_to_user(blob_ptr, blob->data, blob->length)){
			ret = -EFAULT;
			goto done;
		}
	}
	out_resp->length = blob->length;

done:
	mutex_unlock(&dev->mode_config.mutex);
	return ret;
}

This weakness involves numeric computation errors, such as integer overflows, underflows, or precision losses, which can lead to miscalculations and exploitable behaviors in software.