static void drms_uA_update(struct regulator_dev *rdev)
{
	struct regulator *sibling;
	int current_uA = 0, output_uV, input_uV, err;
	unsigned int mode;

	err = regulator_check_drms(rdev);
	if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
	    (!rdev->desc->ops->get_voltage &&
	     !rdev->desc->ops->get_voltage_sel) ||
	    !rdev->desc->ops->set_mode)
		return;

	/* get output voltage */
	output_uV = _regulator_get_voltage(rdev);
	if (output_uV <= 0)
		return;

	/* get input voltage */
	input_uV = 0;
	if (rdev->supply)
		input_uV = regulator_get_voltage(rdev->supply);
	if (input_uV <= 0)
		input_uV = rdev->constraints->input_uV;
	if (input_uV <= 0)
		return;

	/* calc total requested load */
	list_for_each_entry(sibling, &rdev->consumer_list, list)
		current_uA += sibling->uA_load;

	/* now get the optimum mode for our new total regulator load */
	mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
						  output_uV, current_uA);

	/* check the new mode is allowed */
	err = regulator_mode_constrain(rdev, &mode);
	if (err == 0)
		rdev->desc->ops->set_mode(rdev, mode);
}

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 Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.