[OpenSIPS-Devel] [OpenSIPS/opensips] 926504: next_branches(): Fix bugs leading to READ on freed...

[Liviu Chircu]

  Branch: refs/heads/3.2
  Home:   https://github.com/OpenSIPS/opensips
  Commit: 92650481bcaf740634cc51f74101eb6fbfa74383
      https://github.com/OpenSIPS/opensips/commit/92650481bcaf740634cc51f74101eb6fbfa74383
  Author: Liviu Chircu <liviu at opensips.org>
  Date:   2022-11-17 (Thu, 17 Nov 2022)

  Changed paths:
    M serialize.c

  Log Message:
  -----------
  next_branches(): Fix bugs leading to READ on freed shared memory

This patch fixes two code paths leading to the @avp pointer being freed,
after which the dangling pointer is read afterwards by the
search_next_avp() function at the "done" goto label.  This will work
99% of the time, until the 1% where it won't (crash and burn!).

Many thanks to Richard Revels (@rrevels-bw) and Sebastien Couture for
an accurate report, as well as their involvement in troubleshooting!

Fixes #2446
Fixes #2950

(cherry picked from commit 578fc2907374477449313c36e4fc3287701de800)


  Commit: 5f27da33f6526e54179ccdc48c21234c2233ffa9
      https://github.com/OpenSIPS/opensips/commit/5f27da33f6526e54179ccdc48c21234c2233ffa9
  Author: Liviu Chircu <liviu at opensips.org>
  Date:   2022-11-17 (Thu, 17 Nov 2022)

  Changed paths:
    M serialize.c

  Log Message:
  -----------
  next_branches(): Fix infinite looping during error handling

If someone has actually taken the time to corrupt the internal
"$avp(serial_branch)" AVP, do not perform the "infinite while loop dance"
and correctly progress to the next AVP.

(cherry picked from commit 244cc92919c1cd6b3bf6a52bd4325b0268c88c76)


Compare: https://github.com/OpenSIPS/opensips/compare/d3df2e2b6435...5f27da33f652