<!-- Kamailio Pull Request Template -->

<!-- IMPORTANT: - for detailed contributing guidelines, read: https://github.com/kamailio/kamailio/blob/master/.github/CONTRIBUTING.md - pull requests must be done to master branch, unless they are backports of fixes from master branch to a stable branch - backports to stable branches must be done with 'git cherry-pick -x ...' - code is contributed under BSD for core and main components (tm, sl, auth, tls) - code is contributed GPLv2 or a compatible license for the other components - GPL code is contributed with OpenSSL licensing exception -->

#### Pre-Submission Checklist <!-- Go over all points below, and after creating the PR, tick all the checkboxes that apply --> <!-- All points should be verified, otherwise, read the CONTRIBUTING guidelines from above--> <!-- If you're unsure about any of these, don't hesitate to ask on sr-dev mailing list --> - [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 <!-- Describe your changes in detail -->

segfault

``` #0 0x0000ffffb9934840 in cfg_update_local (no_cbs=0) at ../../core/cfg/cfg_struct.h:366 366 cfg_child_cb = cfg_child_cb->next; (gdb) print cfg_child_cb $1 = (cfg_child_cb_t *) 0x0 ```

example lua:

``` function ksr_route_nats() KSR.tm.t_newtran() local tindex = KSR.pv.gete("$T(id_index)") local tlabel = KSR.pv.gete("$T(id_label)") KSR.tmx.t_suspend()

local req = { jsonrpc = "2.0", method = "route", id = tindex .. ':' .. tlabel, params = { from = KSR.pv.gete("$fu"), to = KSR.pv.gete("$tu"), } } local rpc = cjson.encode(req) KSR.info("rpc: " .. rpc .. "\n") KSR.nats.publish("cn.xswitch.ctrl.route", rpc) KSR.x.exit(); end

function handle_nats_response(data) msg = cjson.decode(data) if (not msg) or (not msg.id) then return end KSR.info("========= msg.id: " .. msg.id .. "\n")

if not msg.result then KSR.error("response has no result\n") return end

tindex, tlabel = msg.id:match("(.+):(.+)") if tindex and tlabel then KSR.pv.sets('$var(nats_response)', data) KSR.tmx.t_continue(tindex, tlabel, 'ksr_nats_continue') end end ```

I'm not sure if it's the proper fix, but this pr fixed the seg. Thanks.

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

https://github.com/kamailio/kamailio/pull/3396

-- Commit Summary --

* core: fix a seg while t_continue with nats module

-- File Changes --

M src/core/cfg/cfg_struct.h (2)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/3396.patch https://github.com/kamailio/kamailio/pull/3396.diff