linux-kernel - Re: [PATCH] nouveau_connector: add nv

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Date:   Tue, 13 Jun 2023 16:52:25 -0400
From:   Lyude Paul <lyude@...hat.com>
To:     Natalia Petrova <n.petrova@...tech.ru>,
        Ben Skeggs <bskeggs@...hat.com>
Cc:     Karol Herbst <kherbst@...hat.com>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org
Subject: Re: [PATCH] nouveau_connector: add nv_encoder pointer check for NULL

Nice catch!

Reviewed-by: Lyude Paul <lyude@...hat.com>

Will push upstream

On Fri, 2023-05-12 at 13:33 +0300, Natalia Petrova wrote:
> Pointer nv_encoder could be dereferenced at nouveau_connector.c
> in case it's equal to NULL by jumping to goto label.
> This patch adds a NULL-check to avoid it.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: 3195c5f9784a ("drm/nouveau: set encoder for lvds")
> Signed-off-by: Natalia Petrova <n.petrova@...tech.ru>
> ---
>  drivers/gpu/drm/nouveau/nouveau_connector.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
> index 43a9d1e1cf71..90ba6d0a9c80 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_connector.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
> @@ -729,7 +729,8 @@ nouveau_connector_detect_lvds(struct drm_connector *connector, bool force)
>  #endif
>  
>  	nouveau_connector_set_edid(nv_connector, edid);
> -	nouveau_connector_set_encoder(connector, nv_encoder);
> +	if (nv_encoder)
> +		nouveau_connector_set_encoder(connector, nv_encoder);
>  	return status;
>  }
>  

-- 
Cheers,
 Lyude Paul (she/her)
 Software Engineer at Red Hat