Re: ldap_get_value returns corrupt pointer

[Philip Guenther <guenther+ldapdev@sendmail.com>]

On Tue, 20 Sep 2011, kyle king wrote:
> On 09/20/2011 06:21 PM, kyle king wrote:
> > Under heavy threaded use ldap_get_value returns a corrupted memory
> > pointer, not a char pointer pointer that was specified.
> I have narrowed the corruption problem down to the file
> libraries/libldap/get_values.c apoximatly line 80 the ber_scanf in the
> if statement.
>  
> When it work on my machine, it returns pointers for 'vals' such as:
> 
> vals pointer: 0x105c920
> 
> and when it fails:
> vals pointer 0x7f6130004c20

Is this a follow up to a previous posting that actually described what you 
were going?  If so, I don't see it in the list archives.  So:

What version of OpenLDAP?

Is the client linked against libldap_r or libldap?

What's the model for how threads are using LDAP handles?  E.g.,
 - each LDAP handle used by only one thread at a time, from operation
   to result
 - each LDAP handle used concurrently by many threads, with app-level 
   locks 
 - each LDAP handle used concurrently by many threads, without app-level 
   locks

Is TLS/SSL involved?  If so, are the thread-safety requirements of that 
library being independently set up by the application?  (IIRC, using 
libldap_r handled that for at least OpenSSL, but I haven't stayed up on 
whether that's still the case or whether it applies to GNUtls or NSS.)


Philip Guenther