获取DNS服务2处内存泄露

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res_state res = malloc(sizeof(struct __res_state));
int result = res_ninit(res); // 内存泄露1, 使用leaks检测发现有内存泄露问题，是什么原因？

NSMutableArray *servers = [[NSMutableArray alloc] init];
if (result == 0) {
    union res_9_sockaddr_union *addr_union = malloc(res->nscount * sizeof(union res_9_sockaddr_union)); // 内存泄露2
    res_getservers(res, addr_union, res->nscount);
    
    for (int i = 0; i < res->nscount; i++) {
        if (addr_union[i].sin.sin_family == AF_INET) {
            char ip[INET_ADDRSTRLEN];
            inet_ntop(AF_INET, &(addr_union[i].sin.sin_addr), ip, INET_ADDRSTRLEN);
            NSString *dnsIP = [NSString stringWithUTF8String:ip];
            [servers addObject:dnsIP];
        } else if (addr_union[i].sin6.sin6_family == AF_INET6) {
            char ip[INET6_ADDRSTRLEN];
            inet_ntop(AF_INET6, &(addr_union[i].sin6.sin6_addr), ip, INET6_ADDRSTRLEN);
            NSString *dnsIP = [NSString stringWithUTF8String:ip];
            [servers addObject:dnsIP];
        }
    }
    free(addr_union); // fix: 内存泄露2
}

res_nclose(res);
free(res);

[TuDoudong]

大佬，知道什么原因了么

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谢谢你的来信，有有空常联系哦！