C and OpenCV memory leaks

Question

I have problem with memory leaks. In this simple program:

#include <stdlib.h>
#include <stdio.h>
#include "opencv2/core/core.hpp"
#include "opencv2/highgui/highgui.hpp"

int main() {
    CvMat *src;
    src = cvLoadImageM("p1.jpg", CV_LOAD_IMAGE_GRAYSCALE);
    cvSaveImage("p2.bmp", src, 0);  
    cvReleaseMat(&src);
    return 0;
}

According to valgrind, there are 7 leaks:

==10478== HEAP SUMMARY:
==10478==     in use at exit: 10,464 bytes in 7 blocks
==10478==   total heap usage: 154 allocs, 147 frees, 2,908,450 bytes allocated
==10478== 
==10478== LEAK SUMMARY:
==10478==    definitely lost: 0 bytes in 0 blocks
==10478==    indirectly lost: 0 bytes in 0 blocks
==10478==      possibly lost: 0 bytes in 0 blocks
==10478==    still reachable: 10,464 bytes in 7 blocks
==10478==         suppressed: 0 bytes in 0 blocks
==10478== Rerun with --leak-check=full to see details of leaked memory
==10478== 
==10478== For counts of detected and suppressed errors, rerun with: -v
==10478== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 2 from 2)

Can anybody tell me how to properly free memory? Thank you for your advice.

Answer 1

@user4815162342 is probably right. Though I recommend you migrate to new C++ OpenCv cv::Mat through which memory management is automatic.

Answer 2

I've seen this leak many times. Check the detailed errors above what you sent. It's probably the pixman lib.