netdev - Re: SFQ qdisc crashes with limit of 2 packets

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Message-ID: <46F11F46.8060108@trash.net>
Date:	Wed, 19 Sep 2007 15:08:22 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Alexey Kuznetsov <kuznet@....inr.ac.ru>
CC:	Chuck Ebbert <cebbert@...hat.com>, Netdev <netdev@...r.kernel.org>
Subject: Re: SFQ qdisc crashes with limit of 2 packets

Alexey Kuznetsov wrote:
> Hello!
> 
>>CCed Alexey just to be safe, but I think the patch should be fine.
> 
> 
> Yes. But what'a about limit == 1? tc prohibits this case, but it is still
> not nice to have the bug in kernel. Plus, code remains creepy, the check
> 
> +	if (++sch->q.qlen < q->limit) {
> 
> still looks as a scary off-by-one. I would go all the way: replace this
> with natural:
> 
> 	if (++sch->q.qlen <= q->limit) {
> 
> and maxed q->limit at SFQ_DEPTH-2. Patch enclosed.


Thats even better, thanks :)
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