netdev - Re: [PATCH net-next] net_sched: fix error recovery at qdisc creation

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Date:   Sat, 11 Feb 2017 21:39:23 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     eric.dumazet@...il.com
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net-next] net_sched: fix error recovery at qdisc
 creation

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 10 Feb 2017 10:31:49 -0800

> From: Eric Dumazet <edumazet@...gle.com>
> 
> Dmitry reported uses after free in qdisc code [1]
> 
> The problem here is that ops->init() can return an error.
> 
> qdisc_create_dflt() then call ops->destroy(),
> while qdisc_create() does _not_ call it.
> 
> Four qdisc chose to call their own ops->destroy(), assuming their caller
> would not.
> 
> This patch makes sure qdisc_create() calls ops->destroy()
> and fixes the four qdisc to avoid double free.
 ...
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: Dmitry Vyukov <dvyukov@...gle.com>

Applied, thanks Eric.