netdev - Re: [PATCH] sch_qfq: fix overflow in qfq_update

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Date:	Tue, 03 Jan 2012 12:59:07 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, shemminger@...tta.com, dave.taht@...il.com
Subject: Re: [PATCH] sch_qfq: fix overflow in qfq_update_start()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Mon, 02 Jan 2012 16:47:57 +0100

> grp->slot_shift is between 22 and 41, so using 32bit wide variables is
> probably a typo.
> 
> This could explain QFQ hangs Dave reported to me, after 2^23 packets ?
> 
> (23 = 64 - 41)
> 
> Reported-by: Dave Taht <dave.taht@...il.com>
> CC: Stephen Hemminger <shemminger@...tta.com>
> CC: Dave Taht <dave.taht@...il.com>

Applied, thanks Eric.
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