to avoid null pointer access for malformed messages

Pre-Submission Checklist

• Commit message has the format required by CONTRIBUTING guide
• Commits are split per component (core, individual modules, libs, utils, ...)
• Each component has a single commit (if not, squash them into one commit)
• 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

• 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:

• PR should be backported to stable branches
• 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

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