linux-kernel - Re: radeon_connector_unregister NULL ptr deref

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Message-ID: <390d15df-04d4-3c5a-a69a-b5f552b72d90@daenzer.net>
Date:   Mon, 24 Oct 2016 16:46:30 +0900
From:   Michel Dänzer <michel@...nzer.net>
To:     Borislav Petkov <bp@...en8.de>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
Subject: Re: radeon_connector_unregister NULL ptr deref

On 24/10/16 04:34 PM, Borislav Petkov wrote:
> Hi guys,
> 
> I'm getting a NULL ptr deref splat when hibernating my box with
> 4.9-rc1+. All I got so far is an ugly camera shot from the splat which
> I'm typing in by hand.
> 
> Any ideas or already a fix?
> 
> The callstack looks like this:
> 
> unable to handle kernel NULL pointer dereference at 00...0890 (I think it is 890)
> IP: radeon_connector_unregister+0xc/0x40
> ...
> 
> ? drm_connector_unregister.part
> drm_connector_unregister_all
> drm_modeset_unregister_all
> drm_dev_unregister
> drm_put_dev
> radeon_pci_shutdown
> pci_device_shutdown
> device_shutdown
> kernel_power_off
> power_down
> hibernate
> ...

Should be fixed in -rc2, specifically these commits:

https://cgit.freedesktop.org/~airlied/linux/commit/?h=drm-next&id=b0c80bd5d2e317f7596fe2badc1a3379fb3211e5
https://cgit.freedesktop.org/~airlied/linux/commit/?h=drm-next&id=9305ee6fe52035f63d70d023235b792ba22107f0


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer