netdev - Re: [PATCH bpf-next] libbf: fix uninitialized pointer at btf__parse

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Message-ID: <CAADnVQLohzfYs7RLFt09aG6QqC8HVO2CgzJ08jyoUybJt10bDg@mail.gmail.com>
Date:   Thu, 6 Aug 2020 16:48:04 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     John Fastabend <john.fastabend@...il.com>
Cc:     "Daniel T. Lee" <danieltimlee@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andriin@...com>,
        Network Development <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH bpf-next] libbf: fix uninitialized pointer at btf__parse_raw()

On Wed, Aug 5, 2020 at 11:22 PM John Fastabend <john.fastabend@...il.com> wrote:
>
> Daniel T. Lee wrote:
> > Recently, from commit 94a1fedd63ed ("libbpf: Add btf__parse_raw() and
> > generic btf__parse() APIs"), new API has been added to libbpf that
> > allows to parse BTF from raw data file (btf__parse_raw()).
> >
> > The commit derives build failure of samples/bpf due to improper access
> > of uninitialized pointer at btf_parse_raw().
> >
> >     btf.c: In function btf__parse_raw:
> >     btf.c:625:28: error: btf may be used uninitialized in this function
> >       625 |  return err ? ERR_PTR(err) : btf;
> >           |         ~~~~~~~~~~~~~~~~~~~^~~~~
> >
> > This commit fixes the build failure of samples/bpf by adding code of
> > initializing btf pointer as NULL.
> >
> > Fixes: 94a1fedd63ed ("libbpf: Add btf__parse_raw() and generic btf__parse() APIs")
> > Signed-off-by: Daniel T. Lee <danieltimlee@...il.com>
> > ---
>
> Unless errno is zero this should be ok in practice, but I guess compiler
> wont know that.
>
> Acked-by: John Fastabend <john.fastabend@...il.com>

Applied. Thanks