[riot-notifications] [RIOT-OS/RIOT] gnrc_ipv6_ext: don't read from `pkt->data` after `_demux()` (#11580)
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Fri May 24 22:10:03 CEST 2019
The RIOT community cares a lot about code quality.
Therefore, before describing what your contribution is about, we would like
you to make sure that your modifications are compliant with the RIOT
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### Contribution description
`_demux()` might change `pkt->data` in all kind of ways (moving it due
to `gnrc_pktbuf_mark()`, though unlikely, releasing it, because e.g. it
starts with a fragment header that marks a fragmented packet containing
only one fragment, etc.) so accessing the pointer *after* calling
`_demux()` is somewhat playing with fire. This change avoids this by
storing the value of `ext_hdr->nh` (all we are interested in here) in a
temporary variable that then is used to set the out-parameter `nh`.
`protnum` needs to be unchanged before the call to `_demux()` as it was
set by the previous iteration and determines what extension header
actually is handled.
Put here the description of your contribution:
- describe which part(s) of RIOT is (are) involved
- if it's a bug fix, describe the bug that it solves and how it is solved
- you can also give more information to reviewers about how to test your changes
### Testing procedure
export BOARD="<your favorite>"
make -C tests/gnrc_ipv6_ext flash
sudo make -C tests/gnrc_ipv6_ext test
should still pass.
Details steps to test your contribution:
- which test/example to compile for which board and is there a 'test' command
- how to know that it was not working/available in master
- the expected success test output
### Issues/PRs references
Examples: Fixes #1234. See also #5678. Depends on PR #9876.
Please use keywords (e.g., fixes, resolve) with the links to the issues you
resolved, this way they will be automatically closed when your pull request
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You can view, comment on, or merge this pull request online at:
-- Commit Summary --
* gnrc_ipv6_ext: don't read from `pkt->data` after `_demux()`
-- File Changes --
M sys/net/gnrc/network_layer/ipv6/ext/gnrc_ipv6_ext.c (6)
-- Patch Links --
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