netdev - Re: [PATCH net] sch_sfq: fix null pointer dereference at timer expiration

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Date:   Tue, 28 Nov 2017 09:50:40 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Paolo Abeni <pabeni@...hat.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Jiri Pirko <jiri@...nulli.us>,
        "David S. Miller" <davem@...emloft.net>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH net] sch_sfq: fix null pointer dereference at timer expiration

On Tue, Nov 28, 2017 at 5:28 AM, Paolo Abeni <pabeni@...hat.com> wrote:
> While converting sch_sfq to use timer_setup(), the commit cdeabbb88134
> ("net: sched: Convert timers to use timer_setup()") forgot to
> initialize the 'sch' field. As a result, the timer callback tries to
> dereference a NULL pointer, and the kernel does oops.
>
> Fix it initializing such field at qdisc creation time.
>
> Fixes: cdeabbb88134 ("net: sched: Convert timers to use timer_setup()")
> Signed-off-by: Paolo Abeni <pabeni@...hat.com>

Acked-by: Cong Wang <xiyou.wangcong@...il.com>