static int f2fs_quota_sync(struct super_block *sb, int type)
{
	struct quota_info *dqopt = sb_dqopt(sb);
	int cnt;
	int ret;

	ret = dquot_writeback_dquots(sb, type);
	if (ret)
		return ret;

	/*
	 * Now when everything is written we can discard the pagecache so
	 * that userspace sees the changes.
	 */
	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
		if (type != -1 && cnt != type)
			continue;
		if (!sb_has_quota_active(sb, cnt))
			continue;

		ret = filemap_write_and_wait(dqopt->files[cnt]->i_mapping);
		if (ret)
			return ret;

		inode_lock(dqopt->files[cnt]);
		truncate_inode_pages(&dqopt->files[cnt]->i_data, 0);
		inode_unlock(dqopt->files[cnt]);
	}
	return 0;
}

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.