Skip to Content.
Sympa Menu

freetds - Re: [freetds] Segfault With Invalid Credentials

freetds AT lists.ibiblio.org

Subject: FreeTDS Development Group

List archive

Chronological Thread  
  • From: <Mitchell_Freed AT McAfee.com>
  • To: <freetds AT lists.ibiblio.org>
  • Subject: Re: [freetds] Segfault With Invalid Credentials
  • Date: Thu, 1 Mar 2012 11:53:34 -0800

I'll see if I can track down exactly where it's getting confused.

- Mitch

On 02/29/2012 06:44 PM, James K. Lowden wrote:

On Wed, 29 Feb 2012 08:58:39 -0800
<Mitchell_Freed AT McAfee.com><mailto:Mitchell_Freed AT McAfee.com> wrote:

> The error occurs in mem.c when trying to free the TDSLOGIN*. I
> noticed that the TDSLOGIN* allocated in tds_alloc_login is a
> different pointer than the one being passed to tds_free_login.
> Looking into it a bit closer the tds_free_login is failing on the
> TDSLOGIN* allocated from tds_alloc_connection -- if that helps.

On the error path from a connection failure, ct_connect() calls a host
of free_* routines, some of which call other freers, some through
pointers. It's possible something goes wrong. Not obvious, but
possible.

You could attack it through your malloc(3). Most C standard libraries
have ways to make invalid frees fail in a noisy way.

Thanks for reporting the problem...

--jkl
_______________________________________________
FreeTDS mailing list
FreeTDS AT lists.ibiblio.org<mailto:FreeTDS AT lists.ibiblio.org>
http://lists.ibiblio.org/mailman/listinfo/freetds




Archive powered by MHonArc 2.6.24.

Top of Page