static ssize_t f2fs_quota_read(struct super_block *sb, int type, char *data,
			       size_t len, loff_t off)
{
	struct inode *inode = sb_dqopt(sb)->files[type];
	struct address_space *mapping = inode->i_mapping;
	block_t blkidx = F2FS_BYTES_TO_BLK(off);
	int offset = off & (sb->s_blocksize - 1);
	int tocopy;
	size_t toread;
	loff_t i_size = i_size_read(inode);
	struct page *page;
	char *kaddr;

	if (off > i_size)
		return 0;

	if (off + len > i_size)
		len = i_size - off;
	toread = len;
	while (toread > 0) {
		tocopy = min_t(unsigned long, sb->s_blocksize - offset, toread);
repeat:
		page = read_mapping_page(mapping, blkidx, NULL);
		if (IS_ERR(page))
			return PTR_ERR(page);

		lock_page(page);

		if (unlikely(page->mapping != mapping)) {
			f2fs_put_page(page, 1);
			goto repeat;
		}
		if (unlikely(!PageUptodate(page))) {
			f2fs_put_page(page, 1);
			return -EIO;
		}

		kaddr = kmap_atomic(page);
		memcpy(data, kaddr + offset, tocopy);
		kunmap_atomic(kaddr);
		f2fs_put_page(page, 1);

		offset = 0;
		toread -= tocopy;
		data += tocopy;
		blkidx++;
	}
	return len;
}

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.