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Re: OID/BER memory oddness
From: Evan Huus <eapache () gmail com>
Date: Tue, 17 Dec 2013 14:37:02 -0500

On Sun, Dec 15, 2013 at 2:20 PM, Ed Beroset <beroset () mindspring com> wrote:
Ed Beroset wrote:

Evan Huus wrote:


The part that's confusing me is that somehow
actx->external.direct_reference seems to be getting a pointer to this
stale ep-allocated buffer, but I can't find anywhere in the call stack
that value could be set to such a stale buffer.


That would probably be dissect_ber_OBJECT_IDENTIFIER which calls
dissect_ber_object_identifier_str(), which calls
dissect_ber_any_oid_str() which calls oid_encoded2string.


As a correction, I was looking a little more at your original message with
the trace, and I think that in your case it's more likely to be the call to
dissect_x509af_T_extnId().  It's the line that's created by the DEFAULT_BODY
line in asn1/x509af/x509af.cnf line 90.  If you look at the generated code,
you'll see that it creates a call to dissect_ber_object_identifier_str() the
last parameter of which is &actx->external.direct_reference.

Thanks for your suggestions. I did a little more digging and
documented my findings in bug 9573. Don't think it will be that easy
to fix unfortunately, but at least I understand what's going on now.

[1] https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=9573
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