static struct ctl_table_header *new_links(struct ctl_dir *dir, struct ctl_table *table,
	struct ctl_table_root *link_root)
{
	struct ctl_table *link_table, *entry, *link;
	struct ctl_table_header *links;
	struct ctl_node *node;
	char *link_name;
	int nr_entries, name_bytes;

	name_bytes = 0;
	nr_entries = 0;
	for (entry = table; entry->procname; entry++) {
		nr_entries++;
		name_bytes += strlen(entry->procname) + 1;
	}

	links = kzalloc(sizeof(struct ctl_table_header) +
			sizeof(struct ctl_node)*nr_entries +
			sizeof(struct ctl_table)*(nr_entries + 1) +
			name_bytes,
			GFP_KERNEL);

	if (!links)
		return NULL;

	node = (struct ctl_node *)(links + 1);
	link_table = (struct ctl_table *)(node + nr_entries);
	link_name = (char *)&link_table[nr_entries + 1];

	for (link = link_table, entry = table; entry->procname; link++, entry++) {
		int len = strlen(entry->procname) + 1;
		memcpy(link_name, entry->procname, len);
		link->procname = link_name;
		link->mode = S_IFLNK|S_IRWXUGO;
		link->data = link_root;
		link_name += len;
	}
	init_header(links, dir->header.root, dir->header.set, node, link_table);
	links->nreg = nr_entries;

	return links;
}

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.