to avoid null pointer access for malformed messages #### Pre-Submission Checklist - [x] Commit message has the format required by CONTRIBUTING guide - [x] Commits are split per component (core, individual modules, libs, utils, ...) - [x] Each component has a single commit (if not, squash them into one commit) - [x] No commits to README files for modules (changes must be done to docbook files in `doc/` subfolder, the README file is autogenerated)

#### Type Of Change - [x] Small bug fix (non-breaking change which fixes an issue) - [ ] New feature (non-breaking change which adds new functionality) - [ ] Breaking change (fix or feature that would change existing functionality)

#### Checklist: <!-- Go over all points below, and after creating the PR, tick the checkboxes that apply --> - [x] PR should be backported to stable branches - [x] Tested changes locally - [ ] Related to issue #XXXX (replace XXXX with an open issue number)

#### Description after adding modparam("dialog", "track_cseq_updates", 1) and getting some malformed SIP kamailio crushed

You can view, comment on, or merge this pull request online at:

https://github.com/kamailio/kamailio/pull/1552

-- Commit Summary --

* dialog: check CSeq careful with track_cseq_updates

-- File Changes --

M src/modules/dialog/dlg_cseq.c (3)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/1552.patch https://github.com/kamailio/kamailio/pull/1552.diff