static int suspend_set_state(struct regulator_dev *rdev,
	struct regulator_state *rstate)
{
	int ret = 0;

	/* If we have no suspend mode configration don't set anything;
	 * only warn if the driver implements set_suspend_voltage or
	 * set_suspend_mode callback.
	 */
	if (!rstate->enabled && !rstate->disabled) {
		if (rdev->desc->ops->set_suspend_voltage ||
		    rdev->desc->ops->set_suspend_mode)
			rdev_warn(rdev, "No configuration\n");
		return 0;
	}

	if (rstate->enabled && rstate->disabled) {
		rdev_err(rdev, "invalid configuration\n");
		return -EINVAL;
	}

	if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
		ret = rdev->desc->ops->set_suspend_enable(rdev);
	else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
		ret = rdev->desc->ops->set_suspend_disable(rdev);
	else /* OK if set_suspend_enable or set_suspend_disable is NULL */
		ret = 0;

	if (ret < 0) {
		rdev_err(rdev, "failed to enabled/disable\n");
		return ret;
	}

	if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
		ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
		if (ret < 0) {
			rdev_err(rdev, "failed to set voltage\n");
			return ret;
		}
	}

	if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
		ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
		if (ret < 0) {
			rdev_err(rdev, "failed to set mode\n");
			return ret;
		}
	}
	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 Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.