static struct regulator_dev *regulator_dev_lookup(struct device *dev,
						  const char *supply,
						  int *ret)
{
	struct regulator_dev *r;
	struct device_node *node;
	struct regulator_map *map;
	const char *devname = NULL;

	regulator_supply_alias(&dev, &supply);

	/* first do a dt based lookup */
	if (dev && dev->of_node) {
		node = of_get_regulator(dev, supply);
		if (node) {
			list_for_each_entry(r, &regulator_list, list)
				if (r->dev.parent &&
					node == r->dev.of_node)
					return r;
			*ret = -EPROBE_DEFER;
			return NULL;
		} else {
			/*
			 * If we couldn't even get the node then it's
			 * not just that the device didn't register
			 * yet, there's no node and we'll never
			 * succeed.
			 */
			*ret = -ENODEV;
		}
	}

	/* if not found, try doing it non-dt way */
	if (dev)
		devname = dev_name(dev);

	list_for_each_entry(r, &regulator_list, list)
		if (strcmp(rdev_get_name(r), supply) == 0)
			return r;

	list_for_each_entry(map, &regulator_map_list, list) {
		/* If the mapping has a device set up it must match */
		if (map->dev_name &&
		    (!devname || strcmp(map->dev_name, devname)))
			continue;

		if (strcmp(map->supply, supply) == 0)
			return map->regulator;
	}


	return NULL;
}

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 Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.