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crash in libcurl - Symbian

From: Frank McGeough <>
Date: Sun, 17 May 2009 18:44:48 -0400

After getting libcurl to compile for Symbian - Nokia 5th edition SDK
1,0 - I began implementing a protocol that sits on top of HTTP/HTTPS.
Although simple GETs and POSTs work fine. A GET with my own headers
supplied crashes with a memory overrun down in curlib. Perhaps I'm
doing something wrong but I've narrowed the code down as much as I can
and its just not doing that much. Here it is :

void testGetWithHeaders(char* url)
     CURL *curl;
     CURLcode curl_result;

     curl = curl_easy_init();

     if (curl)
         curl_easy_setopt(curl, CURLOPT_URL, url);
         struct curl_slist *headers=NULL;
         headers = curl_slist_append(headers, "x-mm-clientid: nmm:xyz3.1$oper_at_nok.b71.cyld
         headers = curl_slist_append(headers, "x-mm-commandid: 2");
         headers = curl_slist_append(headers, "x-mm-cookie:
         headers = curl_slist_append(headers, "x-mm-cookie:
         curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);

         curl_result = curl_easy_perform(curl);
         if (curl_result == CURLE_OK)
             std::cout << "OK!" << std::endl;
             // something went wrong - error code is in curl_result
             std::cout << "libcurl error code #" << curl_result <<

The crash occurs in curl_easy_perform. It looks like after the GET
returns with the data (the server sends back HTTP/1.1 200 OK), the
curlib attempts to write a giant amount of data back. This is because
data->req.upload_present is set to -103. That value gets passed in as
size_t len in :

CURLcode Curl_write(struct connectdata *conn, curl_socket_t sockfd,
const void *mem, size_t len, ssize_t *written)

and becomes 4294967188.

If anyone has suggestions to track this down further or some idea of
something stupid that I'm doing they'd be appreciated. thanks.
Received on 2009-05-18