netdev - Re: [PATCH bpf-next] selftests/bpf: don't destroy failed link

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Date:   Wed, 29 Jul 2020 00:30:52 -0500
From:   YiFei Zhu <zhuyifei@...gle.com>
To:     Andrii Nakryiko <andriin@...com>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org, ast@...com,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>, kernel-team@...com
Subject: Re: [PATCH bpf-next] selftests/bpf: don't destroy failed link

On Tue, Jul 28, 2020 at 11:51 PM Andrii Nakryiko <andriin@...com> wrote:
>
> Check that link is NULL or proper pointer before invoking bpf_link__destroy().
> Not doing this causes crash in test_progs, when cg_storage_multi selftest
> fails.
>
> Cc: YiFei Zhu <zhuyifei@...gle.com>
> Fixes: 3573f384014f ("selftests/bpf: Test CGROUP_STORAGE behavior on shared egress + ingress")
> Signed-off-by: Andrii Nakryiko <andriin@...com>
> ---
>  .../bpf/prog_tests/cg_storage_multi.c         | 42 ++++++++++++-------
>  1 file changed, 28 insertions(+), 14 deletions(-)
>

Awesome! Thanks for the fix. I did not realize the return was a -errno
rather than NULL like open_and_load.