static int _regulator_do_enable(struct regulator_dev *rdev)
{
	int ret, delay;

	/* Query before enabling in case configuration dependent.  */
	ret = _regulator_get_enable_time(rdev);
	if (ret >= 0) {
		delay = ret;
	} else {
		rdev_warn(rdev, "enable_time() failed: %d\n", ret);
		delay = 0;
	}

	trace_regulator_enable(rdev_get_name(rdev));

	if (rdev->desc->off_on_delay) {
		/* if needed, keep a distance of off_on_delay from last time
		 * this regulator was disabled.
		 */
		unsigned long start_jiffy = jiffies;
		unsigned long intended, max_delay, remaining;

		max_delay = usecs_to_jiffies(rdev->desc->off_on_delay);
		intended = rdev->last_off_jiffy + max_delay;

		if (time_before(start_jiffy, intended)) {
			/* calc remaining jiffies to deal with one-time
			 * timer wrapping.
			 * in case of multiple timer wrapping, either it can be
			 * detected by out-of-range remaining, or it cannot be
			 * detected and we gets a panelty of
			 * _regulator_enable_delay().
			 */
			remaining = intended - start_jiffy;
			if (remaining <= max_delay)
				_regulator_enable_delay(
						jiffies_to_usecs(remaining));
		}
	}

	if (rdev->ena_pin) {
		ret = regulator_ena_gpio_ctrl(rdev, true);
		if (ret < 0)
			return ret;
		rdev->ena_gpio_state = 1;
	} else if (rdev->desc->ops->enable) {
		ret = rdev->desc->ops->enable(rdev);
		if (ret < 0)
			return ret;
	} else {
		return -EINVAL;
	}

	/* Allow the regulator to ramp; it would be useful to extend
	 * this for bulk operations so that the regulators can ramp
	 * together.  */
	trace_regulator_enable_delay(rdev_get_name(rdev));

	_regulator_enable_delay(delay);

	trace_regulator_enable_complete(rdev_get_name(rdev));

	return 0;
}

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 Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.