linux-kernel - Re: [PATCH] drm/amdgpu: fix multiple memory leaks

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Date:   Wed, 18 Sep 2019 17:31:49 +0000
From:   "Koenig, Christian" <Christian.Koenig@....com>
To:     Navid Emamdoost <navid.emamdoost@...il.com>
CC:     "emamd001@....edu" <emamd001@....edu>,
        "smccaman@....edu" <smccaman@....edu>,
        "kjlu@....edu" <kjlu@....edu>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        "Zhou, David(ChunMing)" <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Rex Zhu <Rex.Zhu@....com>,
        Sam Ravnborg <sam@...nborg.org>,
        "amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/amdgpu: fix multiple memory leaks

Am 18.09.19 um 18:09 schrieb Navid Emamdoost:
> In acp_hw_init there are some allocations that needs to be released in
> case of failure:
>
> 1- adev->acp.acp_genpd should be released if any allocation attemp for
> adev->acp.acp_cell, adev->acp.acp_res or i2s_pdata fails.
> 2- all of those allocations should be released if pm_genpd_add_device
> fails.

Good catch, but please use goto error handling instead of adding more 
and more kfree calls.

Regards,
Christian.

>
> Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c | 10 +++++++++-
>   1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c
> index eba42c752bca..dd3fa85b11c5 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c
> @@ -231,17 +231,21 @@ static int acp_hw_init(void *handle)
>   	adev->acp.acp_cell = kcalloc(ACP_DEVS, sizeof(struct mfd_cell),
>   							GFP_KERNEL);
>   
> -	if (adev->acp.acp_cell == NULL)
> +	if (adev->acp.acp_cell == NULL) {
> +		kfree(adev->acp.acp_genpd);
>   		return -ENOMEM;
> +	}
>   
>   	adev->acp.acp_res = kcalloc(5, sizeof(struct resource), GFP_KERNEL);
>   	if (adev->acp.acp_res == NULL) {
> +		kfree(adev->acp.acp_genpd);
>   		kfree(adev->acp.acp_cell);
>   		return -ENOMEM;
>   	}
>   
>   	i2s_pdata = kcalloc(3, sizeof(struct i2s_platform_data), GFP_KERNEL);
>   	if (i2s_pdata == NULL) {
> +		kfree(adev->acp.acp_genpd);
>   		kfree(adev->acp.acp_res);
>   		kfree(adev->acp.acp_cell);
>   		return -ENOMEM;
> @@ -348,6 +352,10 @@ static int acp_hw_init(void *handle)
>   		r = pm_genpd_add_device(&adev->acp.acp_genpd->gpd, dev);
>   		if (r) {
>   			dev_err(dev, "Failed to add dev to genpd\n");
> +			kfree(adev->acp.acp_genpd);
> +			kfree(adev->acp.acp_res);
> +			kfree(adev->acp.acp_cell);
> +			kfree(i2s_pdata);
>   			return r;
>   		}
>   	}