[OpenSIPS-Devel] [OpenSIPS/opensips] 0952c1: rr: Fix ordering issues with add_rr_param() and cr...

[Liviu Chircu]

  Branch: refs/heads/3.0
  Home:   https://github.com/OpenSIPS/opensips
  Commit: 0952c19222f504f22d978e000b4f964f26eca544
      https://github.com/OpenSIPS/opensips/commit/0952c19222f504f22d978e000b4f964f26eca544
  Author: Liviu Chircu <liviu at opensips.org>
  Date:   2020-06-25 (Thu, 25 Jun 2020)

  Changed paths:
    M modules/rr/record.c

  Log Message:
  -----------
  rr: Fix ordering issues with add_rr_param() and create_dialog()

Commits bd1719dcf and c263182ee4d introduced regressions for
record_route() and record_route_preset(), respectively, which caused
add_rr_param() to not work anymore in the following sequence of function
calls:

create_dialog() with a "dlg_match_mode" != DID_NONE
record_route() or record_route_preset()
add_rr_param() # would not do anything, simply acting as a NOP

The reason is that the "fake" lump chain which was meant to hold
all add_rr_param() operations prior to an eventual record_route() call
would no longer be masked after the record_route() and would continue to
accumulate data from subsequent add_rr_param() calls.  Since it was
meant to be a "fake" chain from the beginning (maybe the user doesn't
call record_route() at all!), the data would simply be lost.

Many thanks to John Quick for the accurate report and instructions on
how to reproduce the issue!

(cherry picked from commit e3ca95ecd0b3f33b7f42f3a7eda4a6e686cb241d)