linux-kernel - Re: [PATCH v2] drm/amdgpu: fix multiple memory leaks

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Message-ID: <88fc639a-32ed-b6c6-f930-552083d5887d@amd.com>
Date:   Thu, 19 Sep 2019 08:03:33 +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 v2] drm/amdgpu: fix multiple memory leaks

Am 18.09.19 um 21:05 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.
>
> v2: moved the released into goto error handlings
>
> Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c | 30 +++++++++++++++++--------
>   1 file changed, 21 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c
> index eba42c752bca..c0db75b71859 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c
> @@ -184,7 +184,7 @@ static struct device *get_mfd_cell_dev(const char *device_name, int r)
>    */
>   static int acp_hw_init(void *handle)
>   {
> -	int r, i;
> +	int r, i, ret;
>   	uint64_t acp_base;
>   	u32 val = 0;
>   	u32 count = 0;
> @@ -231,20 +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)
> -		return -ENOMEM;
> +	if (adev->acp.acp_cell == NULL) {
> +		ret = -ENOMEM;
> +		goto out1;
> +	}
>   
>   	adev->acp.acp_res = kcalloc(5, sizeof(struct resource), GFP_KERNEL);
>   	if (adev->acp.acp_res == NULL) {
> -		kfree(adev->acp.acp_cell);
> -		return -ENOMEM;
> +		ret = -ENOMEM;
> +		goto out2;
>   	}
>   
>   	i2s_pdata = kcalloc(3, sizeof(struct i2s_platform_data), GFP_KERNEL);
>   	if (i2s_pdata == NULL) {
> -		kfree(adev->acp.acp_res);
> -		kfree(adev->acp.acp_cell);
> -		return -ENOMEM;
> +		ret = -ENOMEM;
> +		goto out3;
>   	}
>   
>   	switch (adev->asic_type) {
> @@ -348,7 +349,8 @@ 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");
> -			return r;
> +			ret = r;
> +			goto out4;
>   		}
>   	}
>   
> @@ -393,6 +395,16 @@ static int acp_hw_init(void *handle)
>   	val &= ~ACP_SOFT_RESET__SoftResetAud_MASK;
>   	cgs_write_register(adev->acp.cgs_device, mmACP_SOFT_RESET, val);
>   	return 0;
> +
> +out4:
> +	kfree(i2s_pdata);
> +out3:
> +	kfree(adev->acp.acp_res);
> +out2:
> +	kfree(adev->acp.acp_cell);
> +out1:
> +	kfree(adev->acp.acp_genpd);

kfree on a NULL pointer is harmless, so a single error label should be 
sufficient.

Christian.

> +	return ret;
>   }
>   
>   /**