static void _regulator_enable_delay(unsigned int delay)
{
	unsigned int ms = delay / 1000;
	unsigned int us = delay % 1000;

	if (ms > 0) {
		/*
		 * For small enough values, handle super-millisecond
		 * delays in the usleep_range() call below.
		 */
		if (ms < 20)
			us += ms * 1000;
		else
			msleep(ms);
	}

	/*
	 * Give the scheduler some room to coalesce with any other
	 * wakeup sources. For delays shorter than 10 us, don't even
	 * bother setting up high-resolution timers and just busy-
	 * loop.
	 */
	if (us >= 10)
		usleep_range(us, us + 100);
	else
		udelay(us);
}

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.