tools: bpftool: fix crash on bad parameters with JSON

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If bad or unrecognised parameters are specified after JSON output is
requested, `usage()` will try to output null JSON object before the
writer is created.

To prevent this, create the writer as soon as the `--json` option is
parsed.

Fixes: 004b45c0e5 ("tools: bpftool: provide JSON output for all possible commands")
Reported-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

...

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Quentin Monnet 2017-11-28 17:44:28 -08:00 • committed by Daniel Borkmann

parent a39e17b2d8

commit 9b85c2d450

1 changed files with 9 additions and 10 deletions

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tools/bpf/bpftool/main.c

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