Thanks all of you for providing the inputs, and with your help, I think I found out the problem.
In my test program I am calling the function "X509_STORE_get_by_subject(ctx, X509_LU_CRL, issuer, &obj)" to get the CRL list. But after this function call, I didn't use the "X509_OBJECT_free_contents()" to free the contents of the returned object "obj". It seems this is the cause of the memory leak. By adding "X509_OBJECT_free_contents(&obj)" function, the Purify does not report any memory leaks. Thanks Bob -----Original Message----- From: owner-openssl-us...@openssl.org [mailto:owner-openssl-us...@openssl.org] On Behalf Of Chris Dodd Sent: Friday, June 24, 2011 5:30 PM To: openssl-users@openssl.org Subject: Re: Question regarding to memory leak On Fri, Jun 24, 2011, Yan, Bob wrote: > Hi, > > I have used IBM purify to check my test program which invokes openssl > library. There are some memory leaks reported by Purify, please see > below. Could somebody point to me from which function those leaks were > generated, and how to avoid those leaks? Thanks, Bob > > > MLK: 1104 bytes leaked in 46 blocks > This memory was allocated from: > malloc [rtlib.o] > CRYPTO_malloc [libcrypto.so.1.0.0] > ASN1_STRING_type_new [libcrypto.so.1.0.0] ASN1_primitive_new > [libcrypto.so.1.0.0] asn1_item_ex_combine_new [libcrypto.so.1.0.0] > asn1_item_ex_combine_new [libcrypto.so.1.0.0] ASN1_item_ex_d2i > [libcrypto.so.1.0.0] asn1_template_noexp_d2i [libcrypto.so.1.0.0] > Block of 24 bytes (46 times); last block at 0x2aaaac0f7218 I've used valgrind with OpenSSL based programs to find memory leaks, and with it, you can use a "--num-callers=N" option to get deeper stack traces in the leak reports. You need a depth of 15-20 to get far enough to see where your code is calling into the OpenSSL code in most cases. There's probably a similar option for IBM purify. -chris ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager majord...@openssl.org ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager majord...@openssl.org
