netdev - Re: [Patch net] net_sched: invoke ->attach() after setting dev->qdisc

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Date:	Wed, 27 May 2015 14:11:08 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	xiyou.wangcong@...il.com
Cc:	netdev@...r.kernel.org, jhs@...atatu.com
Subject: Re: [Patch net] net_sched: invoke ->attach() after setting
 dev->qdisc

From: Cong Wang <xiyou.wangcong@...il.com>
Date: Tue, 26 May 2015 16:08:48 -0700

> For mq qdisc, we add per tx queue qdisc to root qdisc
> for display purpose, however, that happens too early,
> before the new dev->qdisc is finally set, this causes
> q->list points to an old root qdisc which is going to be
> freed right before assigning with a new one.
> 
> Fix this by moving ->attach() after setting dev->qdisc.
> 
> For the record, this fixes the following crash:
 ...
> For long term, we probably need to clean up the qdisc_graft() code
> in case it hides other bugs like this.
> 
> Fixes: 95dc19299f74 ("pkt_sched: give visibility to mq slave qdiscs")
> Cc: Jamal Hadi Salim <jhs@...atatu.com>
> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>

Applied, and queued up for -stable, thanks!
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