netdev - Re: [PATCH] net-sched: sch_cbq: avoid infinite loop

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Message-Id: <20120911.222131.2305298175633650636.davem@davemloft.net>
Date:	Tue, 11 Sep 2012 22:21:31 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	denys@...p.net.lb, netdev@...r.kernel.org
Subject: Re: [PATCH] net-sched: sch_cbq: avoid infinite loop

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 12 Sep 2012 01:11:12 +0200

> From: Eric Dumazet <edumazet@...gle.com>
> 
> Its possible to setup a bad cbq configuration leading to
> an infinite loop in cbq_classify()
> 
> DEV_OUT=eth0
> ICMP="match ip protocol 1 0xff"
> U32="protocol ip u32"
> DST="match ip dst"
> tc qdisc add dev $DEV_OUT root handle 1: cbq avpkt 1000 \
> 	bandwidth 100mbit
> tc class add dev $DEV_OUT parent 1: classid 1:1 cbq \
> 	rate 512kbit allot 1500 prio 5 bounded isolated
> tc filter add dev $DEV_OUT parent 1: prio 3 $U32 \
> 	$ICMP $DST 192.168.3.234 flowid 1:
> 
> Reported-by: Denys Fedoryschenko <denys@...p.net.lb>
> Tested-by: Denys Fedoryschenko <denys@...p.net.lb>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied and queued up for -stable, thanks Eric.
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