int dissolve_free_huge_page(struct page *page)
{
	int rc = 0;

	spin_lock(&hugetlb_lock);
	if (PageHuge(page) && !page_count(page)) {
		struct page *head = compound_head(page);
		struct hstate *h = page_hstate(head);
		int nid = page_to_nid(head);
		if (h->free_huge_pages - h->resv_huge_pages == 0) {
			rc = -EBUSY;
			goto out;
		}
		/*
		 * Move PageHWPoison flag from head page to the raw error page,
		 * which makes any subpages rather than the error page reusable.
		 */
		if (PageHWPoison(head) && page != head) {
			SetPageHWPoison(page);
			ClearPageHWPoison(head);
		}
		list_del(&head->lru);
		h->free_huge_pages--;
		h->free_huge_pages_node[nid]--;
		h->max_huge_pages--;
		update_and_free_page(h, head);
	}
out:
	spin_unlock(&hugetlb_lock);
	return rc;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.