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freetds - Re: [freetds] Segfault With Invalid Credentials

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  • From: "James K. Lowden" <jklowden AT freetds.org>
  • To: freetds AT lists.ibiblio.org
  • Subject: Re: [freetds] Segfault With Invalid Credentials
  • Date: Wed, 29 Feb 2012 20:44:36 -0500

On Wed, 29 Feb 2012 08:58:39 -0800
<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




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