static int tty_tiocmget(struct tty_struct *tty, int __user *p)
{
	int retval = -EINVAL;

	if (tty->ops->tiocmget) {
		retval = tty->ops->tiocmget(tty);

		if (retval >= 0)
			retval = put_user(retval, p);
	}
	return retval;
}

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.