linux-kernel - Re: BUG: 4.10 rtlwifi regression

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Message-ID: <20170109022521.GA9125@shells.gnugeneration.com>
Date:   Sun, 8 Jan 2017 20:25:21 -0600
From:   lkml@...garu.com
To:     Larry Finger <Larry.Finger@...inger.net>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: BUG: 4.10 rtlwifi regression - NULL pointer dereference

On Sun, Jan 08, 2017 at 08:03:18PM -0600, Larry Finger wrote:
> On 01/08/2017 07:41 PM, lkml@...garu.com wrote:
> > Hello list,
> > 
> > Gave 4.10-rc2 a shot today using the attached config.  The kernel panics
> > with a NULL pointer dereference upon starting dhclient after
> > wpa_supplicant.
> > 
> > The network device is a USB dongle:
> > Bus 002 Device 002: ID 7392:7811 Edimax Technology Co., Ltd EW-7811Un 802.11n Wireless Adapter [Realtek RTL8188CUS]
> > 
> > Reverting 'ba9f93f rtlwifi: Fix enter/exit power_save' prevents the
> > crash.
> > 
> > Sorry I don't have a verbatim capture of the panic, but I was able to
> > catch the relevant parts and rtl_lps_leave() is dereferencing a NULL hw,
> > below setup_arp_tx() and rtl_is_special_data().  That's what led me to
> > reverting ba9f93f since it clearly plays with that stuff.
> > 
> > FWIW machine is a plain X61s thinkpad, 1.8Ghz.
> > 
> 
> You need the patch from
> http://marc.info/?l=linux-wireless&m=148234081512703&w=2. It was pushed with
> the notation that it needed to be included in 4.10; however, it has not yet
> percolated through the system.
> 

Thanks for the quick response Larry, on a Sunday even!

Cheers,
Vito Caputo