linux-kernel - Re: [PATCH] amdgpu: fixes memleak issue when init failed

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Date:   Tue, 21 Apr 2020 13:22:49 +0200
From:   Christian König <christian.koenig@....com>
To:     Bernard Zhao <bernard@...o.com>,
        Alex Deucher <alexander.deucher@....com>,
        "David (ChunMing) Zhou" <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Tom St Denis <tom.stdenis@....com>,
        Ori Messinger <Ori.Messinger@....com>,
        Sam Ravnborg <sam@...nborg.org>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     opensource.kernel@...o.com
Subject: Re: [PATCH] amdgpu: fixes memleak issue when init failed

Am 21.04.20 um 13:17 schrieb Bernard Zhao:
> VRAM manager and DRM MM when init failed, there is no operaction
> to free kzalloc memory & remove device file.
> This will lead to memleak & cause stability issue.

NAK, failure to create sysfs nodes are not critical.

Christian.

>
> Signed-off-by: Bernard Zhao <bernard@...o.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c | 24 ++++++++++++++++----
>   1 file changed, 19 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
> index 82a3299e53c0..4c5fb153e6b4 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
> @@ -175,30 +175,44 @@ static int amdgpu_vram_mgr_init(struct ttm_mem_type_manager *man,
>   	ret = device_create_file(adev->dev, &dev_attr_mem_info_vram_total);
>   	if (ret) {
>   		DRM_ERROR("Failed to create device file mem_info_vram_total\n");
> -		return ret;
> +		goto VRAM_TOTAL_FAIL;
>   	}
>   	ret = device_create_file(adev->dev, &dev_attr_mem_info_vis_vram_total);
>   	if (ret) {
>   		DRM_ERROR("Failed to create device file mem_info_vis_vram_total\n");
> -		return ret;
> +		goto VIS_VRAM_TOTA_FAIL;
>   	}
>   	ret = device_create_file(adev->dev, &dev_attr_mem_info_vram_used);
>   	if (ret) {
>   		DRM_ERROR("Failed to create device file mem_info_vram_used\n");
> -		return ret;
> +		goto VRAM_USED_FAIL;
>   	}
>   	ret = device_create_file(adev->dev, &dev_attr_mem_info_vis_vram_used);
>   	if (ret) {
>   		DRM_ERROR("Failed to create device file mem_info_vis_vram_used\n");
> -		return ret;
> +		goto VIS_VRAM_USED_FAIL;
>   	}
>   	ret = device_create_file(adev->dev, &dev_attr_mem_info_vram_vendor);
>   	if (ret) {
>   		DRM_ERROR("Failed to create device file mem_info_vram_vendor\n");
> -		return ret;
> +		goto VRAM_VERDOR_FAIL;
>   	}
>   
>   	return 0;
> +
> +VRAM_VERDOR_FAIL:
> +	device_remove_file(adev->dev, &dev_attr_mem_info_vis_vram_used);
> +VIS_VRAM_USED_FAIL:
> +	device_remove_file(adev->dev, &dev_attr_mem_info_vram_used);
> +RVAM_USED_FAIL:
> +	device_remove_file(adev->dev, &dev_attr_mem_info_vis_vram_total);
> +VIS_VRAM_TOTA_FAIL:
> +	device_remove_file(adev->dev, &dev_attr_mem_info_vram_total);
> +VRAM_TOTAL_FAIL:
> +	kfree(mgr);
> +	man->priv = NULL;
> +
> +	return ret;
>   }
>   
>   /**