netdev - Re: BUG triggered in tcp_openreq_init_rwin most likely due to 13d3b1ebe2876

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Date:   Mon, 17 Jul 2017 11:47:20 -0600
From:   David Ahern <dsahern@...il.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     Lawrence Brakmo <brakmo@...com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: BUG triggered in tcp_openreq_init_rwin most likely due to
 13d3b1ebe2876

On 7/17/17 11:23 AM, Cong Wang wrote:
> I bet req->rsk_listener is NULL, I guess we need the following fix:
> 
> diff --git a/include/linux/bpf-cgroup.h b/include/linux/bpf-cgroup.h
> index 360c082e885c..d41d40ac3efd 100644
> --- a/include/linux/bpf-cgroup.h
> +++ b/include/linux/bpf-cgroup.h
> @@ -85,7 +85,7 @@ int __cgroup_bpf_run_filter_sock_ops(struct sock *sk,
>         int __ret = 0;                                                         \
>         if (cgroup_bpf_enabled && (sock_ops)->sk) {            \
>                 typeof(sk) __sk = sk_to_full_sk((sock_ops)->sk);               \
> -               if (sk_fullsock(__sk))                                         \
> +               if (__sk && sk_fullsock(__sk))                                 \
>                         __ret = __cgroup_bpf_run_filter_sock_ops(__sk,         \
>                                                                  sock_ops,     \
>                                                          BPF_CGROUP_SOCK_OPS); \
> 

safe bet. I should have seen that since objdump on the address pointed to

        return (1 << sk->sk_state) & ~(TCPF_TIME_WAIT | TCPF_NEW_SYN_RECV);

in sk_fullsock.

Tested-by: David Ahern <dsahern@...il.com>