linux-kernel - Re: wpa2 hangs v2.6.32-rc5-402-gb6727b1. Revert 7d930bc33653d5592dc386a76a38f39c2e962344 fixed it.

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Message-ID: <20091102171019.GG14046@tuxdriver.com>
Date:	Mon, 2 Nov 2009 12:10:20 -0500
From:	"John W. Linville" <linville@...driver.com>
To:	Jeff Chua <jeff.chua.linux@...il.com>
Cc:	Johannes Berg <johannes@...solutions.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: wpa2 hangs v2.6.32-rc5-402-gb6727b1. Revert
	7d930bc33653d5592dc386a76a38f39c2e962344 fixed it.

On Mon, Nov 02, 2009 at 11:05:07PM +0800, Jeff Chua wrote:
> On Mon, Nov 2, 2009 at 4:49 PM, Johannes Berg <johannes@...solutions.net>wrote:
> 
> > On Sun, 2009-11-01 at 16:53 -0800, Linus Torvalds wrote:
> > > That decodes to
> > > cfg80211_conn_work+89:
> > > ie it looks like 'conn->params.bssid' is NULL and we oops when we try to
> > > load bssid from there. The code is:
> > >       memcpy(bssid, wdev->conn->params.bssid, ETH_ALEN);
> > > And yes, that "memcpy()" was added in that buggy commit.
> >
> > Indeed, thank you. I'd analysed this before but not made the connection
> > with Jeff's report.
> >
> > > So reverting 7d930bc33653d5592dc386a76a38f39c2e962344 is the correct
> > thing
> > > to do. Or somebody needs to fix that piece-of-shit code.
> >
> > Yes ... that params.bssid was != NULL was a bad assumption in that
> > commit. The right thing to do is to add a check and pass NULL through,
> > like I did here:
> > http://thread.gmane.org/gmane.linux.kernel.wireless.general/41695
> >
> 
> That patch fixes the WPA2 hanging the system problem for me.
> 
> Thanks for the quick responses!

I'll roll that up with a few other fixes and send it to Dave M. today.

John
-- 
John W. Linville		Someday the world will need a hero, and you
linville@...driver.com			might be all we have.  Be ready.
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