[openssl-users] freeing of X509_CRL object

[Salz, Rich]

Based on the information you provided, I don’t have any other advice.  The print routine does not free the CRL. You must be free’ing it twice.  Perhaps run under a debugger with a breakpoint

From: Raghavendra a <raghuasit at gmail.com>
Date: Tuesday, May 15, 2018 at 2:58 AM
To: Rich Salz <rsalz at akamai.com>
Cc: openssl-users <openssl-users at openssl.org>
Subject: Re: [openssl-users] freeing of X509_CRL object

Hi,
Yes, I am freeing _x509crl  using X509_CRL_free  after using in X509_CRL_print.
Above valgrind error is for free operation, is it wrong?
Regards,
Raghavendra

On Fri, May 11, 2018 at 5:21 PM, Salz, Rich <rsalz at akamai.com<mailto:rsalz at akamai.com>> wrote:
Something else is going wrong.  Is that the only valgrind error?   Are you sure you didn’t free the object in your code?

From: Raghavendra a <raghuasit at gmail.com<mailto:raghuasit at gmail.com>>
Date: Friday, May 11, 2018 at 6:22 AM
To: Rich Salz <rsalz at akamai.com<mailto:rsalz at akamai.com>>, openssl-users <openssl-users at openssl.org<mailto:openssl-users at openssl.org>>
Subject: Re: [openssl-users] freeing of X509_CRL object

Hi Rich,
Thanks for information.
Any idea, why is X509_CRL_free reporting below error with valgrind?

Valgrind output:
==31919== Invalid read of size 4
==31919==    at 0xB475EF2: CRYPTO_atomic_add (threads_pthread.c:155)
==31919==    by 0xB355537: asn1_do_lock (tasn_utl.c:79)
==31919==    by 0xB352767: asn1_item_embed_free (tasn_fre.c:88)
==31919==    by 0xB3528D4: ASN1_item_free (tasn_fre.c:20)

Regards,
Raghavendra


On Fri, May 11, 2018 at 3:40 PM, Salz, Rich via openssl-users <openssl-users at openssl.org<mailto:openssl-users at openssl.org>> wrote:
The print routine does not free anything.

From: Raghavendra a <raghuasit at gmail.com<mailto:raghuasit at gmail.com>>
Reply-To: openssl-users <openssl-users at openssl.org<mailto:openssl-users at openssl.org>>
Date: Friday, May 11, 2018 at 5:53 AM
To: openssl-users <openssl-users at openssl.org<mailto:openssl-users at openssl.org>>
Subject: [openssl-users] freeing of X509_CRL object

Hi All,
In my program,
converting X509_CRL object to string format using X509_CRL_print and BIO_get_mem_data.  after that if de-allocate  _x509crl  using X509_CRL_free.  it is crashing with below reason.
Valgrind output:
==31919== Invalid read of size 4
==31919==    at 0xB475EF2: CRYPTO_atomic_add (threads_pthread.c:155)
==31919==    by 0xB355537: asn1_do_lock (tasn_utl.c:79)
==31919==    by 0xB352767: asn1_item_embed_free (tasn_fre.c:88)
==31919==    by 0xB3528D4: ASN1_item_free (tasn_fre.c:20)
not sure if X509_CRL_print de-allocates some part of _x509crl ,  external freeing of X509_CRL again leading to double free?
Please help on this issue.

Regards,
Raghavendra




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