netdev - Re: size overflow in function qdisc_tree_decrease_qlen net/sched/sch

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Message-ID: <CAHA+R7M++LboS_2OmhNjoApvFf6Xk-e+vsEgZrFeKG+k1J8edw@mail.gmail.com>
Date:	Tue, 1 Dec 2015 14:47:24 -0800
From:	Cong Wang <cwang@...pensource.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	pageexec@...email.hu, Daniele Fucini <dfucini@...il.com>,
	netdev <netdev@...r.kernel.org>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	David Miller <davem@...emloft.net>, spender@...ecurity.net,
	re.emese@...il.com
Subject: Re: size overflow in function qdisc_tree_decrease_qlen net/sched/sch_api.c

On Tue, Dec 1, 2015 at 2:33 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> Hmm... it looks like we have a much more serious bug :
>
> qdisc_lookup() calls qdisc_match_from_root(dev->qdisc, handle) without
> proper lock being held, so we might actually crash the host,
> if qdisc_tree_decrease_qlen() happens at the time qdiscs are changed.
>
> qdisc_tree_decrease_qlen() needs serious care :(

Convert qdisc list to RCU protected?
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