static void f2fs_write_end_io(struct bio *bio)
{
	struct f2fs_sb_info *sbi = bio->bi_private;
	struct bio_vec *bvec;
	int i;

	bio_for_each_segment_all(bvec, bio, i) {
		struct page *page = bvec->bv_page;
		enum count_type type = WB_DATA_TYPE(page);

		if (IS_DUMMY_WRITTEN_PAGE(page)) {
			set_page_private(page, (unsigned long)NULL);
			ClearPagePrivate(page);
			unlock_page(page);
			mempool_free(page, sbi->write_io_dummy);

			if (unlikely(bio->bi_error))
				f2fs_stop_checkpoint(sbi, true);
			continue;
		}

		fscrypt_pullback_bio_page(&page, true);

		if (unlikely(bio->bi_error)) {
			mapping_set_error(page->mapping, -EIO);
			f2fs_stop_checkpoint(sbi, true);
		}
		dec_page_count(sbi, type);
		clear_cold_data(page);
		end_page_writeback(page);
	}
	if (!get_pages(sbi, F2FS_WB_CP_DATA) &&
				wq_has_sleeper(&sbi->cp_wait))
		wake_up(&sbi->cp_wait);

	bio_put(bio);
}

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.