void f2fs_invalidate_page(struct page *page, unsigned int offset,
							unsigned int length)
{
	struct inode *inode = page->mapping->host;
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);

	if (inode->i_ino >= F2FS_ROOT_INO(sbi) &&
		(offset % PAGE_SIZE || length != PAGE_SIZE))
		return;

	if (PageDirty(page)) {
		if (inode->i_ino == F2FS_META_INO(sbi)) {
			dec_page_count(sbi, F2FS_DIRTY_META);
		} else if (inode->i_ino == F2FS_NODE_INO(sbi)) {
			dec_page_count(sbi, F2FS_DIRTY_NODES);
		} else {
			inode_dec_dirty_pages(inode);
			remove_dirty_inode(inode);
		}
	}

	/* This is atomic written page, keep Private */
	if (IS_ATOMIC_WRITTEN_PAGE(page))
		return;

	set_page_private(page, 0);
	ClearPagePrivate(page);
}

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.