netdev - Re: [PATCH bpf] bpf: bpf_skc_to_* casting helpers require a NULL check on sk

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Date:   Tue, 15 Sep 2020 18:16:20 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Song Liu <song@...nel.org>
Cc:     Martin KaFai Lau <kafai@...com>, bpf <bpf@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>,
        Networking <netdev@...r.kernel.org>, Yonghong Song <yhs@...com>
Subject: Re: [PATCH bpf] bpf: bpf_skc_to_* casting helpers require a NULL
 check on sk

On Tue, Sep 15, 2020 at 2:45 PM Song Liu <song@...nel.org> wrote:
>
> On Tue, Sep 15, 2020 at 11:32 AM Martin KaFai Lau <kafai@...com> wrote:
> >
> > The bpf_skc_to_* type casting helpers are available to
> > BPF_PROG_TYPE_TRACING.  The traced PTR_TO_BTF_ID may be NULL.
> > For example, the skb->sk may be NULL.  Thus, these casting helpers
> > need to check "!sk" also and this patch fixes them.
> >
> > Fixes: 0d4fad3e57df ("bpf: Add bpf_skc_to_udp6_sock() helper")
> > Fixes: 478cfbdf5f13 ("bpf: Add bpf_skc_to_{tcp, tcp_timewait, tcp_request}_sock() helpers")
> > Fixes: af7ec1383361 ("bpf: Add bpf_skc_to_tcp6_sock() helper")
> > Signed-off-by: Martin KaFai Lau <kafai@...com>
>
> Acked-by: Song Liu <songliubraving@...com>

Applied. Thanks