int regulator_sync_voltage(struct regulator *regulator)
{
	struct regulator_dev *rdev = regulator->rdev;
	int ret, min_uV, max_uV;

	mutex_lock(&rdev->mutex);

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

	/* This is only going to work if we've had a voltage configured. */
	if (!regulator->min_uV && !regulator->max_uV) {
		ret = -EINVAL;
		goto out;
	}

	min_uV = regulator->min_uV;
	max_uV = regulator->max_uV;

	/* This should be a paranoia check... */
	ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
	if (ret < 0)
		goto out;

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

	ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);

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 Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.