PassRefPtr<HTMLCollection> Element::ensureCachedHTMLCollection(CollectionType type)
{
    if (HTMLCollection* collection = cachedHTMLCollection(type))
        return collection;

    RefPtr<HTMLCollection> collection;
    if (type == TableRows) {
        ASSERT(hasTagName(tableTag));
        return ensureRareData()->ensureNodeLists()->addCacheWithAtomicName<HTMLTableRowsCollection>(this, type);
    } else if (type == SelectOptions) {
        ASSERT(hasTagName(selectTag));
        return ensureRareData()->ensureNodeLists()->addCacheWithAtomicName<HTMLOptionsCollection>(this, type);
    } else if (type == FormControls) {
        ASSERT(hasTagName(formTag) || hasTagName(fieldsetTag));
        return ensureRareData()->ensureNodeLists()->addCacheWithAtomicName<HTMLFormControlsCollection>(this, type);
    }
    return ensureRareData()->ensureNodeLists()->addCacheWithAtomicName<HTMLCollection>(this, type);
}

This vulnerability category highlights issues in resource management where failures to properly release memory, file handles, or other resources can degrade system performance or enable denial-of-service conditions.