netdev - Re: [PATCH net] bridge: fix br_stp_set_bridge

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Date:	Thu, 18 Jun 2015 03:31:01 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	razor@...ckwall.org
Cc:	netdev@...r.kernel.org, stephen@...workplumber.org,
	joerg@...gsboson.tk
Subject: Re: [PATCH net] bridge: fix br_stp_set_bridge_priority race
 conditions

From: Nikolay Aleksandrov <razor@...ckwall.org>
Date: Mon, 15 Jun 2015 20:28:51 +0300

> After the ->set() spinlocks were removed br_stp_set_bridge_priority
> was left running without any protection when used via sysfs. It can
> race with port add/del and could result in use-after-free cases and
> corrupted lists. Tested by running port add/del in a loop with stp
> enabled while setting priority in a loop, crashes are easily
> reproducible.
> The spinlocks around sysfs ->set() were removed in commit:
> 14f98f258f19 ("bridge: range check STP parameters")
> There's also a race condition in the netlink priority support that is
> fixed by this change, but it was introduced recently and the fixes tag
> covers it, just in case it's needed the commit is:
> af615762e972 ("bridge: add ageing_time, stp_state, priority over netlink")
> 
> Signed-off-by: Nikolay Aleksandrov <razor@...ckwall.org>
> Fixes: 14f98f258f19 ("bridge: range check STP parameters")

Applied and queued up for -stable, thanks.
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