static int ext4_set_bh_endio(struct buffer_head *bh, struct inode *inode)
{
	ext4_io_end_t *io_end;
	struct page *page = bh->b_page;
	loff_t offset = (sector_t)page->index << PAGE_CACHE_SHIFT;
	size_t size = bh->b_size;

retry:
	io_end = ext4_init_io_end(inode, GFP_ATOMIC);
	if (!io_end) {
		if (printk_ratelimit())
			printk(KERN_WARNING "%s: allocation fail\n", __func__);
		schedule();
		goto retry;
	}
	io_end->offset = offset;
	io_end->size = size;
	/*
	 * We need to hold a reference to the page to make sure it
	 * doesn't get evicted before ext4_end_io_work() has a chance
	 * to convert the extent from written to unwritten.
	 */
	io_end->page = page;
	get_page(io_end->page);

	bh->b_private = io_end;
	bh->b_end_io = ext4_end_io_buffer_write;
	return 0;
}
NVD is only using a subset of CWE for mapping instead of the entire CWE, and the weakness type is not covered by that subset.