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Date:   Tue, 15 Sep 2020 14:45:25 -0700
From:   Song Liu <>
To:     Martin KaFai Lau <>
Cc:     bpf <>, Alexei Starovoitov <>,
        Daniel Borkmann <>,
        Kernel Team <>,
        Networking <>, Yonghong Song <>
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 <> wrote:
> The bpf_skc_to_* type casting helpers are available to
> 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 <>

Acked-by: Song Liu <>

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