From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Mon, 2 Jan 2012 05:47:57 +0000 (+0000)
Subject: sch_qfq: fix overflow in qfq_update_start()
X-Git-Tag: v3.2~1^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6bafcac3238758203703bdd4abe9c1f38d259584;p=pandora-kernel.git

sch_qfq: fix overflow in qfq_update_start()

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@gmail.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: Stephen Hemminger <shemminger@vyatta.com>
CC: Dave Taht <dave.taht@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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