int regulator_set_voltage_time(struct regulator *regulator,
			       int old_uV, int new_uV)
{
	struct regulator_dev *rdev = regulator->rdev;
	const struct regulator_ops *ops = rdev->desc->ops;
	int old_sel = -1;
	int new_sel = -1;
	int voltage;
	int i;

	/* Currently requires operations to do this */
	if (!ops->list_voltage || !ops->set_voltage_time_sel
	    || !rdev->desc->n_voltages)
		return -EINVAL;

	for (i = 0; i < rdev->desc->n_voltages; i++) {
		/* We only look for exact voltage matches here */
		voltage = regulator_list_voltage(regulator, i);
		if (voltage < 0)
			return -EINVAL;
		if (voltage == 0)
			continue;
		if (voltage == old_uV)
			old_sel = i;
		if (voltage == new_uV)
			new_sel = i;
	}

	if (old_sel < 0 || new_sel < 0)
		return -EINVAL;

	return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
}

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 Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.