void ion_free(struct ion_client *client, struct ion_handle *handle)
{
	bool valid_handle;

	BUG_ON(client != handle->client);

	mutex_lock(&client->lock);
	valid_handle = ion_handle_validate(client, handle);

	if (!valid_handle) {
		WARN(1, "%s: invalid handle passed to free.\n", __func__);
		mutex_unlock(&client->lock);
		return;
	}
	mutex_unlock(&client->lock);
	ion_handle_put(handle);
}
Weaknesses in this category are related to the management of permissions, privileges, and other security features that are used to perform access control.