RFC 4601, "Protocol Independent Multicast - Sparse Mode (PIM-SM): Protocol Specification (Revised)", August 2006

Note: This RFC has been obsoleted by RFC 7761

Errata ID: 4027
Status: Held for Document Update
Type: Editorial
Publication Format(s) : TEXT
Reported By: Ramakrishna DTV
Date Reported: 2014-06-26
Held for Document Update by: Alia Atlas
Date Held: 2014-07-01

Section 4.8.2 says:

     if( iif == RPF_interface(S) AND UpstreamJPState(S,G) == Joined ) {
         oiflist = inherited_olist(S,G)
     } else if( iif is in inherited_olist(S,G) ) {
         send Assert(S,G) on iif
     }

     oiflist = oiflist (-) iif
     forward packet on all interfaces in oiflist

It should say:

     oiflist = NULL

     if( iif == RPF_interface(S) AND UpstreamJPState(S,G) == Joined ) {
         oiflist = inherited_olist(S,G)
     } else if( iif is in inherited_olist(S,G) ) {
         send Assert(S,G) on iif
     }

     oiflist = oiflist (-) iif
     forward packet on all interfaces in oiflist

Notes:

The followng line is missing:

oiflist = NULL

Without this, it may lead to accessing uninitialized variable
oiflist. This line is present in Section 4.2 from which the simplified
SSM specific pseudo code is derived.

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