Re: [PATCH v2] drm/mediatek: Add missing IS_ERR check for ovl_adaptor platform device

["CK Hu (胡俊光)" <ck.hu@mediatek.com>]

On Tue, 2026-08-25 at 18:08 +0800, Haojie Li wrote:
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> 
> 
> platform_device_register_data() can fail and return an ERR_PTR, but the
> return value is used without checking, leading to an invalid pointer
> being stored in ddp_comp[].dev and passed to component_match_add() and
> mtk_ddp_comp_init(), which could result in a kernel crash.
> 
> Add an IS_ERR() check to jump to the error handling path on failure.

Reviewed-by: CK Hu <ck.hu@mediatek.com>

> 
> Fixes: 0d9eee9118b7 ("drm/mediatek: Add drm ovl_adaptor sub driver for MT8195")
> Cc: stable@vger.kernel.org
> Signed-off-by: Haojie Li <lihaojie@kylinos.cn>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_drv.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> index c86a3f54f35b..b281482ab8c8 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -1112,6 +1112,9 @@ static int mtk_drm_probe(struct platform_device *pdev)
>                                                             PLATFORM_DEVID_AUTO,
>                                                             (void *)private->mmsys_dev,
>                                                             sizeof(*private->mmsys_dev));
> +               if (IS_ERR(ovl_adaptor))
> +                       return PTR_ERR(ovl_adaptor);
> +
>                 private->ddp_comp[DDP_COMPONENT_DRM_OVL_ADAPTOR].dev = &ovl_adaptor->dev;
>                 mtk_ddp_comp_init(dev, NULL, &private->ddp_comp[DDP_COMPONENT_DRM_OVL_ADAPTOR],
>                                   DDP_COMPONENT_DRM_OVL_ADAPTOR);
> --
> 2.25.1
>