linux-kernel - Re: [PATCH] drm/msm/adreno: Fix a reference leak in a6xx_gpu

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Message-ID: <nsw5leex5uwofbhmue52l4zjmwz2wbel7i5tngjysr73ujvgxh@476xtlglkoom>
Date: Fri, 23 Jan 2026 19:58:52 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Felix Gu <ustc.gu@...il.com>
Cc: Rob Clark <robin.clark@....qualcomm.com>, Sean Paul <sean@...rly.run>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Akhil P Oommen <akhilpo@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jesszhan0024@...il.com>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/msm/adreno: Fix a reference leak in a6xx_gpu_init()

On Sat, Jan 24, 2026 at 12:37:38AM +0800, Felix Gu wrote:
> In a6xx_gpu_init(), node is obtained via of_parse_phandle().
> While there was a manual of_node_put() at the end of the
> common path, several early error returns would bypass this call,
> resulting in a reference leak.
> Fix this by using the __free(device_node) cleanup handler to
> release the reference when the variable goes out of scope.
> 
> Fixes: 5a903a44a984 ("drm/msm/a6xx: Introduce GMU wrapper support")
> Signed-off-by: Felix Gu <ustc.gu@...il.com>
> ---
>  drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> index 2129d230a92b..0bc518d9fd65 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> @@ -2640,7 +2640,6 @@ static struct msm_gpu *a6xx_gpu_init(struct drm_device *dev)
>  	struct msm_drm_private *priv = dev->dev_private;
>  	struct platform_device *pdev = priv->gpu_pdev;
>  	struct adreno_platform_config *config = pdev->dev.platform_data;
> -	struct device_node *node;
>  	struct a6xx_gpu *a6xx_gpu;
>  	struct adreno_gpu *adreno_gpu;
>  	struct msm_gpu *gpu;
> @@ -2660,7 +2659,8 @@ static struct msm_gpu *a6xx_gpu_init(struct drm_device *dev)
>  	adreno_gpu->registers = NULL;
>  
>  	/* Check if there is a GMU phandle and set it up */
> -	node = of_parse_phandle(pdev->dev.of_node, "qcom,gmu", 0);
> +	struct device_node *node __free(device_node) =
> +		of_parse_phandle(pdev->dev.of_node, "qcom,gmu", 0);

Missing include for cleanup.h.

>  	/* FIXME: How do we gracefully handle this? */
>  	BUG_ON(!node);
>  
> @@ -2702,7 +2702,6 @@ static struct msm_gpu *a6xx_gpu_init(struct drm_device *dev)
>  		ret = a6xx_gmu_wrapper_init(a6xx_gpu, node);
>  	else
>  		ret = a6xx_gmu_init(a6xx_gpu, node);
> -	of_node_put(node);
>  	if (ret) {
>  		a6xx_destroy(&(a6xx_gpu->base.base));
>  		return ERR_PTR(ret);
> 
> ---
> base-commit: a0c666c25aeefd16f4b088c6549a6fb6b65a8a1d
> change-id: 20260123-a6xx_gpu-cbc095dbe423
> 
> Best regards,
> -- 
> Felix Gu <ustc.gu@...il.com>
> 

-- 
With best wishes
Dmitry