[PATCH] drm/amdgpu: Fail when setting negative DPM levels v2

[Eric Huang]

Reviewed-by: Eric Huang <JinHuiEric.Huang at amd.com>


On 2018-03-02 12:53 PM, Kent Russell wrote:
> kstrtol can handle negative values, which is unchecked here. While
> setting a negative value will result in the mask being 1<<0xffffffff ,
> which the SMU will ignore because it's out of long bits, return an
> error instead of silently failing.
>
> v2 Add similar check for sclk_od and mclk_od
>
> Signed-off-by: Kent Russell <kent.russell at amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c | 10 +++++-----
>   1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
> index 9e73cbc..5bdb421 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
> @@ -476,7 +476,7 @@ static ssize_t amdgpu_set_pp_dpm_sclk(struct device *dev,
>   		sub_str[1] = '\0';
>   		ret = kstrtol(sub_str, 0, &level);
>   
> -		if (ret) {
> +		if (ret || level < 0) {
>   			count = -EINVAL;
>   			goto fail;
>   		}
> @@ -522,7 +522,7 @@ static ssize_t amdgpu_set_pp_dpm_mclk(struct device *dev,
>   		sub_str[1] = '\0';
>   		ret = kstrtol(sub_str, 0, &level);
>   
> -		if (ret) {
> +		if (ret || level < 0) {
>   			count = -EINVAL;
>   			goto fail;
>   		}
> @@ -567,7 +567,7 @@ static ssize_t amdgpu_set_pp_dpm_pcie(struct device *dev,
>   		sub_str[1] = '\0';
>   		ret = kstrtol(sub_str, 0, &level);
>   
> -		if (ret) {
> +		if (ret || level < 0) {
>   			count = -EINVAL;
>   			goto fail;
>   		}
> @@ -606,7 +606,7 @@ static ssize_t amdgpu_set_pp_sclk_od(struct device *dev,
>   
>   	ret = kstrtol(buf, 0, &value);
>   
> -	if (ret) {
> +	if (ret || value < 0) {
>   		count = -EINVAL;
>   		goto fail;
>   	}
> @@ -650,7 +650,7 @@ static ssize_t amdgpu_set_pp_mclk_od(struct device *dev,
>   
>   	ret = kstrtol(buf, 0, &value);
>   
> -	if (ret) {
> +	if (ret || value < 0) {
>   		count = -EINVAL;
>   		goto fail;
>   	}