netdev - [Regression][3.12] bridge: fix NULL pointer deref of br_port_get

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Message-ID: <529E2D14.9000303@canonical.com>
Date:	Tue, 03 Dec 2013 14:12:20 -0500
From:	Joseph Salisbury <joseph.salisbury@...onical.com>
To:	zhiguohong@...cent.com
CC:	"edumazet@...gle.com" <edumazet@...gle.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	Stephen Hemminger <stephen@...workplumber.org>,
	bridge@...ts.linux-foundation.org,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [Regression][3.12] bridge: fix NULL pointer deref of br_port_get_rcu

Hi Hong,

A kernel bug was opened against Ubuntu [0].  After a kernel bisect, it
was found that reverting the following commit resolved
this bug:

commit 716ec052d2280d511e10e90ad54a86f5b5d4dcc2
Author: Hong Zhiguo <zhiguohong@...cent.com>
Date:   Sat Sep 14 22:42:28 2013 +0800

    bridge: fix NULL pointer deref of br_port_get_rcu


The regression was introduced as of v3.12-rc2 and has made it into some
of the stable trees(3.10 and 3.11).

I was thinking of requesting a revert for this commit, but I wanted to
get your feedback first, since you are the patch author.


Thanks,

Joe


[0] http://pad.lv/1249880
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