[OpenSIPS-Devel] [OpenSIPS/opensips] 58a944: usrloc User-Agent filtering: Fix memory corruption

[Liviu Chircu]

  Branch: refs/heads/master
  Home:   https://github.com/OpenSIPS/opensips
  Commit: 58a944cddbfbe7aab47a3e296d8aba5d36454a1e
      https://github.com/OpenSIPS/opensips/commit/58a944cddbfbe7aab47a3e296d8aba5d36454a1e
  Author: Liviu Chircu <liviu at opensips.org>
  Date:   2016-06-16 (Thu, 16 Jun 2016)

  Changed paths:
    M modules/registrar/lookup.c
    M modules/usrloc/ucontact.c

  Log Message:
  -----------
  usrloc User-Agent filtering: Fix memory corruption

The "ua_re_check" macro added by commit e5cb9805bc is broken in several ways:
    * unsafe read operation on shared memory
    * unsafe write operation on shared memory
    * incorrectly handled error case, without restoring the backup byte

This patch corrects the above issues by extending the user_agent buffer.