[6lo] [Errata Verified] RFC8163 (5996)

RFC Errata System <rfc-editor@rfc-editor.org> Fri, 06 August 2021 05:28 UTC

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Subject: [6lo] [Errata Verified] RFC8163 (5996)
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The following errata report has been verified for RFC8163,
"Transmission of IPv6 over Master-Slave/Token-Passing (MS/TP) Networks". 

You may review the report below and at:

Status: Verified
Type: Technical

Reported by: Kerry Lynn <kerlyn@ieee.org>
Date Reported: 2020-02-27
Verified by: Erik Kline (IESG)

Section: Appendix B.

Original Text
        * Sanity check the encoding to prevent the while() loop below
        * from overrunning the output buffer.
       if (read_index + code > length)
         return 0;

Corrected Text
        * Sanity check the encoding to prevent the while() loop below
        * from overrunning the output buffer.
       if (code == 0 || read_index + code > length)
         return 0;

This was submitted as a change to [BACnet], Annex T, by James Butler.  The normative procedure for decoding COBS is correct in [BACnet], but this bug appears in the informative example in Annex T.  Since the purpose of COBS encoding is to eliminate all zero bytes from the data, the presence of a zero indicates an error.

RFC8163 (draft-ietf-6lo-6lobac-08)
Title               : Transmission of IPv6 over Master-Slave/Token-Passing (MS/TP) Networks
Publication Date    : May 2017
Author(s)           : K. Lynn, Ed., J. Martocci, C. Neilson, S. Donaldson
Category            : PROPOSED STANDARD
Source              : IPv6 over Networks of Resource-constrained Nodes
Area                : Internet
Stream              : IETF
Verifying Party     : IESG