netdev - Re: [PATCH 2/3] samples: bpf: cleanup pointer error check with libbpf

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Message-ID: <CAEf4BzbWboyWH1NzvDT8AHxUs4mEV9tBUOyksGgaJrN7QKJLXA@mail.gmail.com>
Date:   Fri, 26 Jun 2020 13:24:54 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     "Daniel T. Lee" <danieltimlee@...il.com>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Yonghong Song <yhs@...com>, Martin KaFai Lau <kafai@...com>,
        Andrii Nakryiko <andriin@...com>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH 2/3] samples: bpf: cleanup pointer error check with libbpf

On Fri, Jun 26, 2020 at 1:18 AM Daniel T. Lee <danieltimlee@...il.com> wrote:
>
> Libbpf has its own helper function to check for errors in the bpf
> data structure (pointer). And Some codes do not use this libbbpf
> helper function and check the pointer's error directly.
>
> This commit clean up the existing pointer error check logic with
> libbpf.
>
> Signed-off-by: Daniel T. Lee <danieltimlee@...il.com>
> ---

This entire patch is wrong. bpf_object__find_program_by_name() returns
NULL if the program is not found, not an error code.

>  samples/bpf/sampleip_user.c    | 2 +-
>  samples/bpf/trace_event_user.c | 2 +-
>  samples/bpf/tracex1_user.c     | 2 +-
>  samples/bpf/tracex5_user.c     | 2 +-
>  samples/bpf/tracex7_user.c     | 2 +-
>  5 files changed, 5 insertions(+), 5 deletions(-)
>

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