linux-kernel - Re: [PATCH] work around for l2cap NULL dereference in l2cap_conn

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Message-ID: <20110305021257.GD9005@joana>
Date:	Fri, 4 Mar 2011 23:12:57 -0300
From:	"Gustavo F. Padovan" <padovan@...fusion.mobi>
To:	David Fries <david@...es.net>
Cc:	Liang Bao <tim.bao@...il.com>,
	Andrei Warkentin <andreiw@...orola.com>,
	linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
	Feng Tang <feng.tang@...el.com>
Subject: Re: [PATCH] work around for l2cap NULL dereference in
 l2cap_conn_start

Hi David,

* David Fries <david@...es.net> [2011-03-02 00:19:10 -0600]:

> On Mon, Feb 28, 2011 at 02:30:22PM -0300, Gustavo F. Padovan wrote:
> > Hi David,
> > 
> > * David Fries <david@...es.net> [2011-02-27 23:03:40 -0600]:
> > 
> > > On Sun, Feb 27, 2011 at 04:15:45PM -0300, Gustavo F. Padovan wrote:
> > > > I pushed the following patch to bluetooth-2.6 tree. It should fix the problem
> > > > by avoiding connections to be accepted before a L2CAP info response comes:
> > > 
> > > Is
> > > git://git.kernel.org/pub/scm/linux/kernel/git/padovan/bluetooth-2.6.git
> > > the bluetooth-2.6 tree you mentioned?  I don't see your patch there.
> > > As a side note, the inline patch in your e-mail has the tabs replaced by
> > > spaces, once I changed them, it applied cleanly.
> > > 
> > > I first reverted to the base N900 kernel-power-2.6.28 46 (none of my
> > > changes or debugging), it crashed as expected.  I then applied your
> > > patch 743400e0, and it still crashed.  I added back the
> > > l2cap_conn_start parent check and some debugging in af_bluetooth.c
> > > dmesg debug output and patches follow.
> > 
> > I want to see a test with this patch and a recent kernel. We added many fixes
> > to stack in the last two years. Can you test this scenario?
> 
> I'm sorry, but apparently not, at least this post says 2.6.37 isn't
> going to happen for the N900 and Maemo.
> http://forums.internettablettalk.com/showthread.php?t=70082
> 
> I tried 2.6.37-n900 from
> git://gitorious.org/nokia-n900-kernel/nokia-n900-kernel.git anyway,
> but the display visibly degrades like it isn't being updated and
> doesn't apparently get any further.  I don't have anyway to debug it
> further.

I think you can test this in a desktop machine.

-- 
Gustavo F. Padovan
http://profusion.mobi
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