netdev - Re: [PATCH net] netem: fix a use after free

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Message-ID: <CAM_iQpXCpV8agcKFnc2rKjFX+LGBcs+icYzvPd16qY_xZcOTMw@mail.gmail.com>
Date:	Mon, 20 Jun 2016 15:53:42 -0700
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	Stephen Hemminger <stephen@...workplumber.org>
Subject: Re: [PATCH net] netem: fix a use after free

On Mon, Jun 20, 2016 at 3:00 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> From: Eric Dumazet <edumazet@...gle.com>
>
> If the packet was dropped by lower qdisc, then we must not
> access it later.
>
> Save qdisc_pkt_len(skb) in a temp variable.
>
> Fixes: 2ccccf5fb43f ("net_sched: update hierarchical backlog too")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Cc: WANG Cong <xiyou.wangcong@...il.com>
> Cc: Jamal Hadi Salim <jhs@...atatu.com>
> Cc: Stephen Hemminger <stephen@...workplumber.org>


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