static int _regulator_do_set_voltage(struct regulator_dev *rdev,
				     int min_uV, int max_uV)
{
	int ret;
	int delay = 0;
	int best_val = 0;
	unsigned int selector;
	int old_selector = -1;

	trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);

	min_uV += rdev->constraints->uV_offset;
	max_uV += rdev->constraints->uV_offset;

	/*
	 * If we can't obtain the old selector there is not enough
	 * info to call set_voltage_time_sel().
	 */
	if (_regulator_is_enabled(rdev) &&
	    rdev->desc->ops->set_voltage_time_sel &&
	    rdev->desc->ops->get_voltage_sel) {
		old_selector = rdev->desc->ops->get_voltage_sel(rdev);
		if (old_selector < 0)
			return old_selector;
	}

	if (rdev->desc->ops->set_voltage) {
		ret = _regulator_call_set_voltage(rdev, min_uV, max_uV,
						  &selector);

		if (ret >= 0) {
			if (rdev->desc->ops->list_voltage)
				best_val = rdev->desc->ops->list_voltage(rdev,
									 selector);
			else
				best_val = _regulator_get_voltage(rdev);
		}

	} else if (rdev->desc->ops->set_voltage_sel) {
		if (rdev->desc->ops->map_voltage) {
			ret = rdev->desc->ops->map_voltage(rdev, min_uV,
							   max_uV);
		} else {
			if (rdev->desc->ops->list_voltage ==
			    regulator_list_voltage_linear)
				ret = regulator_map_voltage_linear(rdev,
								min_uV, max_uV);
			else if (rdev->desc->ops->list_voltage ==
				 regulator_list_voltage_linear_range)
				ret = regulator_map_voltage_linear_range(rdev,
								min_uV, max_uV);
			else
				ret = regulator_map_voltage_iterate(rdev,
								min_uV, max_uV);
		}

		if (ret >= 0) {
			best_val = rdev->desc->ops->list_voltage(rdev, ret);
			if (min_uV <= best_val && max_uV >= best_val) {
				selector = ret;
				if (old_selector == selector)
					ret = 0;
				else
					ret = _regulator_call_set_voltage_sel(
						rdev, best_val, selector);
			} else {
				ret = -EINVAL;
			}
		}
	} else {
		ret = -EINVAL;
	}

	/* Call set_voltage_time_sel if successfully obtained old_selector */
	if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0
		&& old_selector != selector) {

		delay = rdev->desc->ops->set_voltage_time_sel(rdev,
						old_selector, selector);
		if (delay < 0) {
			rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
				  delay);
			delay = 0;
		}

		/* Insert any necessary delays */
		if (delay >= 1000) {
			mdelay(delay / 1000);
			udelay(delay % 1000);
		} else if (delay) {
			udelay(delay);
		}
	}

	if (ret == 0 && best_val >= 0) {
		unsigned long data = best_val;

		_notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
				     (void *)data);
	}

	trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);

	return ret;
}

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.