Memory leaks in d2i_X509_CRL and X509_CRL_free?

[Zhuang Yuyao]

Hi,

I'm testing loading a large CRL file into a X509_CRL structure then
free it. but after X509_CRL_free, there are still some mysterious
memory consumption.

pmap reports that total memory consumption is 105608KB right after the
CRL file was loaded, and 88920K after X509_CRL_free was called.

here is my test code:
// gcc -o a -g a.c
// ./a testcrl.pem
// the crl file size is about 30M bytes, and itsformat is PEM

#include <stdio.h>
#include <string.h>
#include <sys/time.h>
#include <time.h>
#include <sys/syslog.h>
#include <errno.h>
#include <sys/vfs.h>
#include <errno.h>
#define _GNU_SOURCE 1
#include <math.h>
#include <stdlib.h>
#include <unistd.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include <openssl/x509.h>
#include <openssl/bio.h>
#include <openssl/pem.h>

void test4(const char* filename) {
        X509_CRL* crl = NULL;
        BIO* in = NULL;

        in = BIO_new_file(filename, "r");
        if (!in) {
                return;
        }
        crl = PEM_read_bio_X509_CRL(in, NULL, NULL, NULL);
        if (!crl) {
                BIO_reset(in);
                crl = d2i_X509_CRL_bio(in, NULL);
        }
        BIO_free(in);
----> // pmap: total  105608K
        if (crl) {
                X509_CRL_free(crl);
---->        //  pmap: total  88920K
        }
}

int main(int argc, char* argv[]) {
        test4(argv[1]);
        return 0;
}

I am wondering why not all of the memory are freed, and how can I free
those lost memory.

Thanks very much.
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