void copy_io_context(struct io_context **pdst, struct io_context **psrc)
{
	struct io_context *src = *psrc;
	struct io_context *dst = *pdst;

	if (src) {
		BUG_ON(atomic_long_read(&src->refcount) == 0);
		atomic_long_inc(&src->refcount);
		put_io_context(dst);
		*pdst = src;
	}
}

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.