int nfs_generic_flush(struct nfs_pageio_descriptor *desc,
		      struct nfs_pgio_header *hdr)
{
	if (desc->pg_bsize < PAGE_CACHE_SIZE)
		return nfs_flush_multi(desc, hdr);
	return nfs_flush_one(desc, hdr);
}

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.