[riot-notifications] [RIOT-OS/RIOT] gnrc_ipv6_ext_frag: check return value of msg_try_send() (#15526)

Martine Lenders notifications at github.com
Mon Nov 30 15:37:26 CET 2020


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### Contribution description
Addresses parts of #15521. Not checking the return value of `msg_try_send()` could indeed lead to a leak in the packet buffer.
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### Testing procedure
I tried to provide tests for the corner case, but RIOT makes it quite hard to mock filled message queues :-/. However, `tests/gnrc_ipv6_ext_frag` should still pass never the less **NOTE THE SUDO! This test is not run on Murdock**:

```sh
sudo ./dist/tools/tapsetup/tapsetup   # if you haven't already opened a TAP interface
make -C tests/gnrc_ipv6_ext_frag -j
sudo make -C tests/gnrc_ipv6_ext_frag test
```

Of course this also should work with any board supporting `ethos`.
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### Issues/PRs references
Addresses parts of #15521
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You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/15526

-- Commit Summary --

  * gnrc_ipv6_ext_frag: check return value of msg_try_send()

-- File Changes --

    M sys/net/gnrc/network_layer/ipv6/ext/frag/gnrc_ipv6_ext_frag.c (12)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/15526.patch
https://github.com/RIOT-OS/RIOT/pull/15526.diff

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