static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
{
	if (!rdev->constraints)
		return -EINVAL;

	switch (state) {
	case PM_SUSPEND_STANDBY:
		return suspend_set_state(rdev,
			&rdev->constraints->state_standby);
	case PM_SUSPEND_MEM:
		return suspend_set_state(rdev,
			&rdev->constraints->state_mem);
	case PM_SUSPEND_MAX:
		return suspend_set_state(rdev,
			&rdev->constraints->state_disk);
	default:
		return -EINVAL;
	}
}

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 Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.