static struct page *alloc_gigantic_page(int nid, struct hstate *h)
{
	unsigned int order = huge_page_order(h);
	unsigned long nr_pages = 1 << order;
	unsigned long ret, pfn, flags;
	struct zonelist *zonelist;
	struct zone *zone;
	struct zoneref *z;
	gfp_t gfp_mask;

	gfp_mask = htlb_alloc_mask(h) | __GFP_THISNODE;
	zonelist = node_zonelist(nid, gfp_mask);
	for_each_zone_zonelist_nodemask(zone, z, zonelist, gfp_zone(gfp_mask), NULL) {
		spin_lock_irqsave(&zone->lock, flags);

		pfn = ALIGN(zone->zone_start_pfn, nr_pages);
		while (zone_spans_last_pfn(zone, pfn, nr_pages)) {
			if (pfn_range_valid_gigantic(zone, pfn, nr_pages)) {
				/*
				 * We release the zone lock here because
				 * alloc_contig_range() will also lock the zone
				 * at some point. If there's an allocation
				 * spinning on this lock, it may win the race
				 * and cause alloc_contig_range() to fail...
				 */
				spin_unlock_irqrestore(&zone->lock, flags);
				ret = __alloc_gigantic_page(pfn, nr_pages, gfp_mask);
				if (!ret)
					return pfn_to_page(pfn);
				spin_lock_irqsave(&zone->lock, flags);
			}
			pfn += nr_pages;
		}

		spin_unlock_irqrestore(&zone->lock, flags);
	}

	return NULL;
}

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.