Re: Crash while freeing data.

sasikumar bodathula sasikumar.b at
Mon May 27 05:16:57 EDT 2013

Thanks for the clue it is working now.

Problem is my kerberos is linking to the openssl library where custom memory management was implemented hence it was crashing in the free.

Then linked to the default openssl now it is working fine

Thanks a lot.

Best Regards,


From: Greg Hudson <ghudson at MIT.EDU>
Sent: Thu, 23 May 2013 20:46:25 
To: sasikumar bodathula <sasikumar.b at>
Cc: kerberos <kerberos at>
Subject: Re: Crash while freeing data.
On 05/23/2013 02:46 AM, sasikumar bodathula wrote:

> In the function cms_signeddata_create we have a pointer called abuf

> which is initialized to NULL.


> FileName :- plugins/preauth/pkinit/pkinit_crypto_openssl.c Line number

> 1121 "ASN1_item_i2d" following function is called with abuf as one of

> the argument.


> After this function abuf is pointer to the invalid pointer this leads to

> the crash in same file line number 1195 free(abuf).

Looking at the OpenSSL code, ASN1_item_i2d should only fill in abuf with

a pointer returned by CRYPTO_malloc(), which is usually equivalent to

malloc(), unless something has called CRYPTO_set_mem_functions() or

similar.  Unless you're doing that in your application, I don't see how

this can explain the crash.

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