linux-kernel - Re: [PATCH 04/10] drm/msm: fix NULL-deref on irq uninstall

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Message-ID: <3025b62f-fbaa-cda3-8ab4-73e86b942450@linaro.org>
Date:   Tue, 21 Mar 2023 17:17:26 +0200
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Johan Hovold <johan+linaro@...nel.org>,
        Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>
Cc:     Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Thomas Zimmermann <tzimmermann@...e.de>
Subject: Re: [PATCH 04/10] drm/msm: fix NULL-deref on irq uninstall

On 06/03/2023 12:07, Johan Hovold wrote:
> In case of early initialisation errors and on platforms that do not use
> the DPU controller, the deinitilisation code can be called with the kms
> pointer set to NULL.
> 
> Fixes: f026e431cf86 ("drm/msm: Convert to Linux IRQ interfaces")
> Cc: stable@...r.kernel.org	# 5.14
> Cc: Thomas Zimmermann <tzimmermann@...e.de>
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

> ---
>   drivers/gpu/drm/msm/msm_drv.c | 8 +++++---
>   1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
> index 17a59d73fe01..2f2bcdb671d2 100644
> --- a/drivers/gpu/drm/msm/msm_drv.c
> +++ b/drivers/gpu/drm/msm/msm_drv.c
> @@ -251,9 +251,11 @@ static int msm_drm_uninit(struct device *dev)
>   		drm_bridge_remove(priv->bridges[i]);
>   	priv->num_bridges = 0;
>   
> -	pm_runtime_get_sync(dev);
> -	msm_irq_uninstall(ddev);
> -	pm_runtime_put_sync(dev);
> +	if (kms) {
> +		pm_runtime_get_sync(dev);
> +		msm_irq_uninstall(ddev);
> +		pm_runtime_put_sync(dev);
> +	}
>   
>   	if (kms && kms->funcs)
>   		kms->funcs->destroy(kms);

-- 
With best wishes
Dmitry