> -----Original Message-----
> From:
> [email protected]
>
> [mailto:[email protected]
> illa.org] On Behalf Of [email protected]
> Sent: Thursday, April 30, 2009 8:34 AM
> To: [email protected]
> Subject: Crash in ldap_unbind()
>
> We are using Mozilla 6.0.5 C SDK. When the LDAP server has a
> short timeout (10 seconds) for the connections, we are
> experiencing consistent crash after calling ldap_unbind().
> Our investigation shows that the crash is caused by the use
> of freed memory. There are multiple references to the same
> memory. After one is used to free the memory, others are
> still used to access that memory.
>
> Here is how the multiple references to the same memory are created.
> When the connection is dropped by LDAP server, we call
> ldap_simple_bind_s() to reconnect. This ultimately calls into
> nsldapi_new_connection(), which has the following code:
>
> lc->lconn_next = ld->ld_conns;
> ld->ld_conns = lc;
>
> This adds a new connection to the LDAP handle which already
> has a connection. The problem is that both of these two
> connections reference the same memory through their
> respective lbextiofn_socket_arg field.
When the connection is dropped by LDAP server, have you called ldap_unbind() to
destroy the handler? And, since you call ldap_simple_bind_s() to do the
binding, you'd better call ldap_unbind_s() to release the handle, instead of
ldap_unbind().
> Later on,we call ldap_unbind() on the LDAP handle. Down the stack,
> ldap_ld_free() has the following code:
>
> while ( ld->ld_conns != NULL ) {
> nsldapi_free_connection( ld,
> ld->ld_conns, serverctrls,
> clientctrls, 1, close );
> }
>
> Ldap_ld_free() is trying to free each connection on the LDAP handle.
> The first iteration frees the memory pointed by
> lbextiofn_socket_arg, the second iteration tries to use it in
> nsldapi_close_connection() and causes crash.
>
> Hopefully I explained clearly the cause of the problem.
> Please advise how this problem can be fixed.
>
> Thanks,
> Yang
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