Wireshark mailing list archives
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 ___________________________________________________________________________ Sent via: Wireshark-dev mailing list <wireshark-dev () wireshark org> Archives: http://www.wireshark.org/lists/wireshark-dev Unsubscribe: https://wireshark.org/mailman/options/wireshark-dev mailto:wireshark-dev-request () wireshark org?subject=unsubscribe
Current thread:
- OID/BER memory oddness Evan Huus (Dec 15)
- Re: OID/BER memory oddness Ed Beroset (Dec 15)
- Re: OID/BER memory oddness Evan Huus (Dec 15)
- Re: OID/BER memory oddness Ed Beroset (Dec 15)
- Re: OID/BER memory oddness Ed Beroset (Dec 15)
- Re: OID/BER memory oddness Evan Huus (Dec 17)
- Re: OID/BER memory oddness Evan Huus (Dec 15)
- Re: OID/BER memory oddness Ed Beroset (Dec 15)