Memory Leak still in my app

[Carlos Roberto Zainos H]

Hi guys and hi Eric !

 

I have been tested my app again and again and following the Dr Stephen recommendations, I discovered that the BIO's are not the problem, all they points to NULL after them has been freed.

 

I think the problem could be in freeing the other structures .........

I have a main Windows service server (Win XP Professional, Visual C++ 6.0 compiler) and Openssl 0.9.7d based, which by means of a call to a CreateThread(...(LPTHREAD_START_ROUTINE) servicio...) function begins a routine called "servicio" which receive a CSR sent by the "client app".

The "servicio" routine makes something like:

X509 *x=NULL, *xreq=NULL, **b=NULL;
X509_REQ *req=NULL, **sr=NULL;

EVP_PKEY *pubkey_ai=NULL;
ASN1_INTEGER *serial=NULL;
ASN1_GENERALIZEDTIME *N_after_gmt=NULL, **out_asn=NULL;
BIO *in=NULL, *incer=NULL, *buf=NULL;

 

 // "x" for the signer cert, "xreq" is the new cert an "b" is for decode the signer cert via PEM_read_bio_X509(in,b,NULL,NULL )

// "req" is the CSR received, "sr" is for decode the CSR via PEM_read_bio_X509_REQ(incer,sr,NULL,NULL)
X509_NAME *dn=NULL;

 

The CSR is decoded, the client pubkey is extracted from it and a new X509 structure is filled with appropriate info. The DB is updated and the client receive an notification, all this works very good. The problem is when I try to free the used structures before exit of "servicio".

 

X509_NAME_free(dn); // frees the dn = X509_NAME_new() of the new cert.

EVP_PKEY_free(pubkey_ai); //the signer public key used to verify the CSR
ASN1_INTEGER_free(serial); //the serial of the new cert
ASN1_GENERALIZEDTIME_free(N_after_gmt); //the adjust of the new cert

BIO_set_close(in, BIO_CLOSE); //this is more efficient, instead only BIO_free()
res = BIO_free(in);

BIO_set_close(incer, BIO_CLOSE);
res = BIO_free(incer);

BIO_set_close(buf, BIO_CLOSE);
res = BIO_free(buf);

X509_REQ_free(req);
X509_free(xreq);
//X509_free(x); <- this breaks my server 

 

So, I don't understand why after 100 consecutive connections the memory grows up 4.5 Kb .... something is not being freed, (bios are not problem) how can I see if the structures are freed?? (points to NULL)

 

I need that my server coul be stable (no memory leak)

Help needed!!!

 

Thanks in advance

Zainos

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