static ssize_t f2fs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
{
	struct address_space *mapping = iocb->ki_filp->f_mapping;
	struct inode *inode = mapping->host;
	size_t count = iov_iter_count(iter);
	loff_t offset = iocb->ki_pos;
	int rw = iov_iter_rw(iter);
	int err;

	err = check_direct_IO(inode, iter, offset);
	if (err)
		return err;

	if (__force_buffered_io(inode, rw))
		return 0;

	trace_f2fs_direct_IO_enter(inode, offset, count, rw);

	down_read(&F2FS_I(inode)->dio_rwsem[rw]);
	err = blockdev_direct_IO(iocb, inode, iter, get_data_block_dio);
	up_read(&F2FS_I(inode)->dio_rwsem[rw]);

	if (rw == WRITE) {
		if (err > 0)
			set_inode_flag(inode, FI_UPDATE_WRITE);
		else if (err < 0)
			f2fs_write_failed(mapping, offset + count);
	}

	trace_f2fs_direct_IO_exit(inode, offset, count, rw, err);

	return err;
}

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.