[sr-dev] [kamailio/kamailio] tm: prevent t_suspend memory leak (#2763)

When suspending while already in t_continue when processing a reply / suspending twice in a reply. Thanks to @giavac https://github.com/kamailio/kamailio/pull/2721 we can now suspend more then once in a reply route. This is working well, however a memory leak was detected. This modification is proposing a solution that will prevent calling `sip_msg_cloner` over an already twice over the same pointer, creating the memory leak. <!-- 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) I assume this is a non "breaking change" since it can only trigger in a very the specific case that was not supported anyway. Conditions when this alternate behavior can trigger: 1- must be in t_suspend 2- must be in a reply `if (msg->first_line.type == SIP_REPLY) {` 3- must have an already cloned `if (t->uac[branch].reply) {` An alternate solution would be to free everything in the cloned message and recreate it. #### Checklist: <!-- Go over all points below, and after creating the PR, tick the checkboxes that apply --> - [ ] PR should be backported to stable branches - [x] Tested changes locally - [ ] Related to issue #XXXX (replace XXXX with an open issue number) load test done that included connections, failures and timeouts while suspending multiple times. ``` 6(31) INFO: tm [t_suspend.c:126]: t_suspend(): [>>>SUSPEND<<<] cloning message ! 53(78) INFO: tm [t_suspend.c:136]: t_suspend(): [>>>SUSPEND<<<] message already cloned, re-using ! ``` ``` Total 100000 INVITE calls sent in 1710825 ms at rate of 58/sec Total 100000 connection responses received in 1714999 ms at rate of 58/sec: >> Detailed connection responses received: - 200 connection responses: 24924 (OK) - 404 connection responses: 25145 (Not Found) - 408 connection responses: 24912 (Request Timeout) - 500 connection responses: 25019 (Internal Server Error) >> Detailed disconnection responses received: - 200 disconnection responses: 24924 (OK) ------ TOTAL responses: 24924 (rate=14/sec) ``` #### Description <!-- Describe your changes in detail --> You can view, comment on, or merge this pull request online at: https://github.com/kamailio/kamailio/pull/2763 -- Commit Summary -- * tm: prevent t_suspend memory leak -- File Changes -- M src/modules/tm/t_suspend.c (21) -- Patch Links -- https://github.com/kamailio/kamailio/pull/2763.patch https://github.com/kamailio/kamailio/pull/2763.diff -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/kamailio/kamailio/pull/2763