static int nl80211_set_reg(struct sk_buff *skb, struct genl_info *info)
{
	struct nlattr *tb[NL80211_REG_RULE_ATTR_MAX + 1];
	struct nlattr *nl_reg_rule;
	char *alpha2;
	int rem_reg_rules, r;
	u32 num_rules = 0, rule_idx = 0;
	enum nl80211_dfs_regions dfs_region = NL80211_DFS_UNSET;
	struct ieee80211_regdomain *rd;

	if (!info->attrs[NL80211_ATTR_REG_ALPHA2])
		return -EINVAL;

	if (!info->attrs[NL80211_ATTR_REG_RULES])
		return -EINVAL;

	alpha2 = nla_data(info->attrs[NL80211_ATTR_REG_ALPHA2]);

	if (info->attrs[NL80211_ATTR_DFS_REGION])
		dfs_region = nla_get_u8(info->attrs[NL80211_ATTR_DFS_REGION]);

	nla_for_each_nested(nl_reg_rule, info->attrs[NL80211_ATTR_REG_RULES],
			    rem_reg_rules) {
		num_rules++;
		if (num_rules > NL80211_MAX_SUPP_REG_RULES)
			return -EINVAL;
	}

	if (!reg_is_valid_request(alpha2))
		return -EINVAL;

	rd = kzalloc(struct_size(rd, reg_rules, num_rules), GFP_KERNEL);
	if (!rd)
		return -ENOMEM;

	rd->n_reg_rules = num_rules;
	rd->alpha2[0] = alpha2[0];
	rd->alpha2[1] = alpha2[1];

	/*
	 * Disable DFS master mode if the DFS region was
	 * not supported or known on this kernel.
	 */
	if (reg_supported_dfs_region(dfs_region))
		rd->dfs_region = dfs_region;

	nla_for_each_nested(nl_reg_rule, info->attrs[NL80211_ATTR_REG_RULES],
			    rem_reg_rules) {
		r = nla_parse_nested_deprecated(tb, NL80211_REG_RULE_ATTR_MAX,
						nl_reg_rule, reg_rule_policy,
						info->extack);
		if (r)
			goto bad_reg;
		r = parse_reg_rule(tb, &rd->reg_rules[rule_idx]);
		if (r)
			goto bad_reg;

		rule_idx++;

		if (rule_idx > NL80211_MAX_SUPP_REG_RULES) {
			r = -EINVAL;
			goto bad_reg;
		}
	}

	/* set_regdom takes ownership of rd */
	return set_regdom(rd, REGD_SOURCE_CRDA);
 bad_reg:
	kfree(rd);
	return r;
}
static int nl80211_set_reg(struct sk_buff *skb, struct genl_info *info)
{
	struct nlattr *tb[NL80211_REG_RULE_ATTR_MAX + 1];
	struct nlattr *nl_reg_rule;
	char *alpha2;
	int rem_reg_rules, r;
	u32 num_rules = 0, rule_idx = 0;
	enum nl80211_dfs_regions dfs_region = NL80211_DFS_UNSET;
	struct ieee80211_regdomain *rd;

	if (!info->attrs[NL80211_ATTR_REG_ALPHA2])
		return -EINVAL;

	if (!info->attrs[NL80211_ATTR_REG_RULES])
		return -EINVAL;

	alpha2 = nla_data(info->attrs[NL80211_ATTR_REG_ALPHA2]);

	if (info->attrs[NL80211_ATTR_DFS_REGION])
		dfs_region = nla_get_u8(info->attrs[NL80211_ATTR_DFS_REGION]);

	nla_for_each_nested(nl_reg_rule, info->attrs[NL80211_ATTR_REG_RULES],
			    rem_reg_rules) {
		num_rules++;
		if (num_rules > NL80211_MAX_SUPP_REG_RULES)
			return -EINVAL;
	}

	if (!reg_is_valid_request(alpha2))
		return -EINVAL;

	rd = kzalloc(struct_size(rd, reg_rules, num_rules), GFP_KERNEL);
	if (!rd)
		return -ENOMEM;

	rd->n_reg_rules = num_rules;
	rd->alpha2[0] = alpha2[0];
	rd->alpha2[1] = alpha2[1];

	 
	if (reg_supported_dfs_region(dfs_region))
		rd->dfs_region = dfs_region;

	nla_for_each_nested(nl_reg_rule, info->attrs[NL80211_ATTR_REG_RULES],
			    rem_reg_rules) {
		r = nla_parse_nested_deprecated(tb, NL80211_REG_RULE_ATTR_MAX,
						nl_reg_rule, reg_rule_policy,
						info->extack);
		if (r)
			goto bad_reg;
		r = parse_reg_rule(tb, &rd->reg_rules[rule_idx]);
		if (r)
			goto bad_reg;

		rule_idx++;

		if (rule_idx > NL80211_MAX_SUPP_REG_RULES) {
			r = -EINVAL;
			goto bad_reg;
		}
	}

	 
	return set_regdom(rd, REGD_SOURCE_CRDA);
 bad_reg:
	kfree(rd);
	return r;
}