static int machine_constraints_voltage(struct regulator_dev *rdev,
	struct regulation_constraints *constraints)
{
	const struct regulator_ops *ops = rdev->desc->ops;
	int ret;

	/* do we need to apply the constraint voltage */
	if (rdev->constraints->apply_uV &&
	    rdev->constraints->min_uV == rdev->constraints->max_uV) {
		int current_uV = _regulator_get_voltage(rdev);
		if (current_uV < 0) {
			rdev_err(rdev,
				 "failed to get the current voltage(%d)\n",
				 current_uV);
			return current_uV;
		}
		if (current_uV < rdev->constraints->min_uV ||
		    current_uV > rdev->constraints->max_uV) {
			ret = _regulator_do_set_voltage(
				rdev, rdev->constraints->min_uV,
				rdev->constraints->max_uV);
			if (ret < 0) {
				rdev_err(rdev,
					"failed to apply %duV constraint(%d)\n",
					rdev->constraints->min_uV, ret);
				return ret;
			}
		}
	}

	/* constrain machine-level voltage specs to fit
	 * the actual range supported by this regulator.
	 */
	if (ops->list_voltage && rdev->desc->n_voltages) {
		int	count = rdev->desc->n_voltages;
		int	i;
		int	min_uV = INT_MAX;
		int	max_uV = INT_MIN;
		int	cmin = constraints->min_uV;
		int	cmax = constraints->max_uV;

		/* it's safe to autoconfigure fixed-voltage supplies
		   and the constraints are used by list_voltage. */
		if (count == 1 && !cmin) {
			cmin = 1;
			cmax = INT_MAX;
			constraints->min_uV = cmin;
			constraints->max_uV = cmax;
		}

		/* voltage constraints are optional */
		if ((cmin == 0) && (cmax == 0))
			return 0;

		/* else require explicit machine-level constraints */
		if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
			rdev_err(rdev, "invalid voltage constraints\n");
			return -EINVAL;
		}

		/* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
		for (i = 0; i < count; i++) {
			int	value;

			value = ops->list_voltage(rdev, i);
			if (value <= 0)
				continue;

			/* maybe adjust [min_uV..max_uV] */
			if (value >= cmin && value < min_uV)
				min_uV = value;
			if (value <= cmax && value > max_uV)
				max_uV = value;
		}

		/* final: [min_uV..max_uV] valid iff constraints valid */
		if (max_uV < min_uV) {
			rdev_err(rdev,
				 "unsupportable voltage constraints %u-%uuV\n",
				 min_uV, max_uV);
			return -EINVAL;
		}

		/* use regulator's subset of machine constraints */
		if (constraints->min_uV < min_uV) {
			rdev_dbg(rdev, "override min_uV, %d -> %d\n",
				 constraints->min_uV, min_uV);
			constraints->min_uV = min_uV;
		}
		if (constraints->max_uV > max_uV) {
			rdev_dbg(rdev, "override max_uV, %d -> %d\n",
				 constraints->max_uV, max_uV);
			constraints->max_uV = max_uV;
		}
	}

	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.