GF_Err prft_Size(GF_Box *s)
{
	GF_ProducerReferenceTimeBox *ptr = (GF_ProducerReferenceTimeBox*)s;

	ptr->size += 4+8+ (ptr->version ? 8 : 4);
	return GF_OK;
}

The product reads data past the end, or before the beginning, of the intended buffer.