linux-kernel - Re: [PATCH 3/3] drm/tests: Fix a use-after-free bug in __drm_kunit_helper_alloc_drm

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Date:   Wed, 20 Sep 2023 03:54:00 -0300
From:   Arthur Grillo <arthurgrillo@...eup.net>
To:     Maxime Ripard <mripard@...nel.org>
Cc:     David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        Javier Martinez Canillas <javierm@...hat.com>,
        Brendan Higgins <brendan.higgins@...ux.dev>,
        David Gow <davidgow@...gle.com>, tales.aparecida@...il.com,
        andrealmeid@...eup.net, mairacanal@...eup.net,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        kunit-dev@...glegroups.com
Subject: Re: [PATCH 3/3] drm/tests: Fix a use-after-free bug in
 __drm_kunit_helper_alloc_drm_device()



On 20/09/23 03:40, Maxime Ripard wrote:
> Hi,
> 
> On Wed, Sep 20, 2023 at 03:11:38AM -0300, Arthur Grillo wrote:
>> In __drm_kunit_helper_alloc_drm_device_with_driver(), a drm_driver is
>> allocated with kunit_kzalloc. If the dev argument was allocated by
>> drm_kunit_helper_alloc_device, its deferred actions would access the
>> already deallocated drm_driver.
> 
> We already have a fix for that in drm-misc-fixes, could you give it a try?

Oh! I didn't see that. I just ran it, it worked! Great fix :)

Best Regards,
~Arthur Grillo

> 
> Thanks!
> Maxime