linux-kernel - Re: [net: sock] BUG: unable to handle kernel NULL pointer dereference at 0000000000000007

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Date:	Wed, 10 Dec 2014 15:51:33 -0800
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Fengguang Wu <fengguang.wu@...el.com>
Cc:	LKP <lkp@...org>, LKML <linux-kernel@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>
Subject: Re: [net: sock] BUG: unable to handle kernel NULL pointer dereference
 at 0000000000000007

On Wed, Dec 10, 2014 at 3:29 PM, Fengguang Wu <fengguang.wu@...el.com> wrote:
> Greetings,
>
> 0day kernel testing robot got the below dmesg and the first bad commit is
>
>     net: sock: allow eBPF programs to be attached to sockets

> [init] Kernel was tainted on startup. Will ignore flags that are already set.
> [init] Started watchdog process, PID is 9354
> [main] Main thread is alive.
> [   21.233581] BUG: unable to handle kernel NULL pointer dereference at 0000000000000007
> [   21.234709] IP: [<ffffffff8156ebda>] sk_attach_bpf+0x39/0xc2

thanks for the report! syscall fuzzer is great.
I missed an extra check. Working on a fix.
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