linux-kernel - Re: [PATCH] drm/nouveau/disp: fix use-after-free in error handling of nouveau_connector

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Message-ID: <20230816093015.GDZNyXJ28y9uspb4Mr@fat_crate.local>
Date:   Wed, 16 Aug 2023 11:30:15 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Karol Herbst <kherbst@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Ben Skeggs <bskeggs@...hat.com>,
        Lyude Paul <lyude@...hat.com>, dri-devel@...ts.freedesktop.org,
        nouveau@...ts.freedesktop.org, Takashi Iwai <tiwai@...e.de>
Subject: Re: [PATCH] drm/nouveau/disp: fix use-after-free in error handling
 of nouveau_connector_create

On Mon, Aug 14, 2023 at 04:49:32PM +0200, Karol Herbst wrote:
> We can't simply free the connector after calling drm_connector_init on it.
> We need to clean up the drm side first.
> 
> It might not fix all regressions from 2b5d1c29f6c4 ("drm/nouveau/disp:
> PIOR DP uses GPIO for HPD, not PMGR AUX interrupts"), but at least it
> fixes a memory corruption in error handling related to that commit.
> 
> Link: https://lore.kernel.org/lkml/20230806213107.GFZNARG6moWpFuSJ9W@fat_crate.local/
> Fixes: 95983aea8003 ("drm/nouveau/disp: add connector class")
> Signed-off-by: Karol Herbst <kherbst@...hat.com>
> ---
>  drivers/gpu/drm/nouveau/nouveau_connector.c | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)

This one ontop of -rc5 doesn't help, unfortunately.

Thx.

-- 
Regards/Gruss,
    Boris.

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