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

	BUG_ON(client != handle->client);

	valid_handle = ion_handle_validate(client, handle);

	if (!valid_handle) {
		WARN(1, "%s: invalid handle passed to free.\n", __func__);
		return;
	}
	ion_handle_put_nolock(handle);
}
Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.