Message-ID: <c0ac71a0-4407-de19-ef7a-05004c3e0a2b@linaro.org>
Date:   Tue, 21 Mar 2023 17:06:26 +0200
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Subject: Re: [PATCH 03/10] drm/msm: fix NULL-deref on snapshot tear down
Content-Language: en-GB
To:     Johan Hovold <johan+linaro@kernel.org>,
        Rob Clark <robdclark@gmail.com>,
        Abhinav Kumar <quic_abhinavk@quicinc.com>
Cc:     Sean Paul <sean@poorly.run>, David Airlie <airlied@gmail.com>,
        Daniel Vetter <daniel@ffwll.ch>, linux-arm-msm@vger.kernel.org,
        dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org,
        linux-kernel@vger.kernel.org, stable@vger.kernel.org
References: <20230306100722.28485-1-johan+linaro@kernel.org>
 <20230306100722.28485-4-johan+linaro@kernel.org>
From:   Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
In-Reply-To: <20230306100722.28485-4-johan+linaro@kernel.org>
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Precedence: bulk

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: 98659487b845 ("drm/msm: add support to take dpu snapshot")
> Cc: stable@vger.kernel.org      # 5.14
> Cc: Abhinav Kumar <quic_abhinavk@quicinc.com>
> Signed-off-by: Johan Hovold <johan+linaro@kernel.org>

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

> ---
>   drivers/gpu/drm/msm/msm_drv.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
> index 9ded384acba4..17a59d73fe01 100644
> --- a/drivers/gpu/drm/msm/msm_drv.c
> +++ b/drivers/gpu/drm/msm/msm_drv.c
> @@ -242,7 +242,8 @@ static int msm_drm_uninit(struct device *dev)
>   		msm_fbdev_free(ddev);
>   #endif
>   
> -	msm_disp_snapshot_destroy(ddev);
> +	if (kms)
> +		msm_disp_snapshot_destroy(ddev);
>   
>   	drm_mode_config_cleanup(ddev);
>   

-- 
With best wishes
Dmitry