int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
{
	struct regulator_dev *rdev = regulator->rdev;
	int ret = 0;
	int old_min_uV, old_max_uV;
	int current_uV;

	mutex_lock(&rdev->mutex);

	/* If we're setting the same range as last time the change
	 * should be a noop (some cpufreq implementations use the same
	 * voltage for multiple frequencies, for example).
	 */
	if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
		goto out;

	/* If we're trying to set a range that overlaps the current voltage,
	 * return succesfully even though the regulator does not support
	 * changing the voltage.
	 */
	if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
		current_uV = _regulator_get_voltage(rdev);
		if (min_uV <= current_uV && current_uV <= max_uV) {
			regulator->min_uV = min_uV;
			regulator->max_uV = max_uV;
			goto out;
		}
	}

	/* sanity check */
	if (!rdev->desc->ops->set_voltage &&
	    !rdev->desc->ops->set_voltage_sel) {
		ret = -EINVAL;
		goto out;
	}

	/* constraints check */
	ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
	if (ret < 0)
		goto out;

	/* restore original values in case of error */
	old_min_uV = regulator->min_uV;
	old_max_uV = regulator->max_uV;
	regulator->min_uV = min_uV;
	regulator->max_uV = max_uV;

	ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
	if (ret < 0)
		goto out2;

	ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
	if (ret < 0)
		goto out2;

out:
	mutex_unlock(&rdev->mutex);
	return ret;
out2:
	regulator->min_uV = old_min_uV;
	regulator->max_uV = old_max_uV;
	mutex_unlock(&rdev->mutex);
	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 Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.