    public function tearDown()
    {
        foreach ($this->cleanup as $file) {
            if (is_scalar($file) && file_exists($file)) {
                unlink($file);
            }
        }
    }
The software constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component.