curl 사용 시 mem leak 관련

struct MemoryStruct
{
    char *memory;
    size_t size;
};
 
size_t WriteMemoryCallback(void *ptr, size_t size, size_t nmemb, void *data)
{
    size_t realsize = size * nmemb;
    struct MemoryStruct *mem = (struct MemoryStruct *)data;
 
    mem->memory = (char *)myrealloc(mem->memory, mem->size + realsize + 1);
    if (mem->memory)
    {
        memcpy(&(mem->memory[mem->size]), ptr, realsize);
        mem->size += realsize;
        mem->memory[mem->size] = 0;
    }
    return realsize;
}
 
void *myrealloc(void *ptr, size_t size)
{
    if(ptr)
        return realloc(ptr, size);
    else
        return malloc(size);
}
 
// 실제 소스에서 curl 부분만 대략적으로 가져온 부분 입니다.
.........................................................
    curl = curl_easy_init();
    {
        printf("curl_easy_init() Fail\n");
        return(-100);
    }
    else
    {
        headerList = curl_slist_append(headerList, headerContentType);
        ..........................
        ..........................
 
        jsonReq = cJSON_CreateObject();
        category = cJSON_CreateArray();
 
        //set jsonReq
        cJSON_AddStringToObject(jsonReq, "flag", "0");
        cJSON_AddStringToObject(jsonReq, "type", "1");
        ..........................
        ..........................
        szReq = cJSON_PrintUnformatted(jsonReq);
        cJSON_Delete(jsonReq);
 
        curl_easy_setopt(curl, CURLOPT_URL, URL);
        curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);     
        curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);     
        curl_easy_setopt(curl, CURLOPT_POST, 1L);               
        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerList); 
        curl_easy_setopt(curl, CURLOPT_POSTFIELDS, szReq);      
        curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);      
        curl_easy_setopt(curl, CURLOPT_FORBID_REUSE, 1);        
        curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1L);           
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&chunk);
 
        CURLcode res = curl_easy_perform(curl);
 
        if(res != CURLE_OK || chunk.size == 0)
        {
            ..........................
            ..........................
        }
        curl_easy_cleanup(curl);
 
        if (szReq)
            free(szReq);
 
        free(chunk.memory);
        chunk.memory = NULL ;
        chunk.size   = 0;
.........................................................