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

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Message-ID: <CAPhsuW7b6oMHgOn0Oyq1Fk-xOws=8tK0Bfmbh-UvZUYUFE-zCQ@mail.gmail.com>
Date:   Tue, 15 Sep 2020 14:45:25 -0700
From:   Song Liu <song@...nel.org>
To:     Martin KaFai Lau <kafai@...com>
Cc:     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 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>