I wrote a simple test program like so:

#include <curl/curl.h>
#include <curl/easy.h>

INT WINAPI
   WinMain(
     HINSTANCE hInstance,
     HINSTANCE hPrevInstance,
     LPSTR lpCmdLine,
     INT nCmdShow)
{
        CURL * curlCurlContext;

        curlCurlContext = curl_easy_init();
                        
        if(curlCurlContext != NULL)
        {
                curl_easy_cleanup(curlCurlContext);
        }

        return 0;
}

Compiled it with OpenSSL 0.9.7 and libCurl 7.10.6 and I get memory
leaks. As far as I can tell this memory is being allocated by the
following call:

        /* Lets get nice error messages */
        SSL_load_error_strings();

in ssluse.c at line 413. So I poked around and found that
curl_easy_cleanup() doesn't cleanup the ssl error strings.
Amending my code by adding

        curl_global_cleanup();

before the line 'return 0;' seemed to solve all the memory leaks. This
didn't seem to match my expectations, these memory leaks wouldn't cause
my program to grow to the sizes i was seeing. So I added some code to
make curl post to a URL (like my program was doing). Like so:

        char * szPostField = "This is a test to locate memory leaks in our
software.";

        curl_easy_setopt(curlCurlContext, CURLOPT_POSTFIELDS, szPostField);
        curl_easy_setopt(curlCurlContext, CURLOPT_POSTFIELDSIZE,
strlen(szPostField));
        curl_easy_setopt(curlCurlContext, CURLOPT_URL, "***https url***");

        curl_easy_perform(curlCurlContext);

My server side script got the post data, the program then exits with the
following debug output:

Detected memory leaks!
Dumping objects ->
{3373} normal block at 0x009FC760, 12 bytes long.
  Data: < > B0 C6 9F 00 00 00 00 00 06 00 00 00
...
{2986} normal block at 0x009F6BA0, 96 bytes long.
  Data: <0l C C > 30 6C 9F 00 C7 05 43 00 BD 05 43 00 08 00 00 00
Object dump complete.

I may require some further analysis to locate these.

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Received on 2003-08-04