Re: [PATCH] drm/amdgpu: Fix regression in adjusting power table/profile

[Alex Deucher <alexdeucher@xxxxxxxxx>]

On Wed, Jul 29, 2020 at 10:20 PM Paweł Gronowski <me@xxxxxxxxxx> wrote:
>
> Regression was introduced in commit 38e0c89a19fd
> ("drm/amdgpu: Fix NULL dereference in dpm sysfs handlers") which
> made the set_pp_od_clk_voltage and set_pp_power_profile_mode return
> -EINVAL for previously valid input. This was caused by an empty
> string (starting at the \0 character) being passed to the kstrtol.
>
> Signed-off-by: Paweł Gronowski <me@xxxxxxxxxx>

Applied.  Thanks!

Alex

> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
> index ebb8a28ff002..cbf623ff03bd 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
> @@ -778,12 +778,14 @@ static ssize_t amdgpu_set_pp_od_clk_voltage(struct device *dev,
>                 tmp_str++;
>         while (isspace(*++tmp_str));
>
> -       while ((sub_str = strsep(&tmp_str, delimiter)) != NULL) {
> +       while ((sub_str = strsep(&tmp_str, delimiter)) && *sub_str) {
>                 ret = kstrtol(sub_str, 0, &parameter[parameter_size]);
>                 if (ret)
>                         return -EINVAL;
>                 parameter_size++;
>
> +               if (!tmp_str)
> +                       break;
>                 while (isspace(*tmp_str))
>                         tmp_str++;
>         }
> @@ -1635,11 +1637,14 @@ static ssize_t amdgpu_set_pp_power_profile_mode(struct device *dev,
>                         i++;
>                 memcpy(buf_cpy, buf, count-i);
>                 tmp_str = buf_cpy;
> -               while ((sub_str = strsep(&tmp_str, delimiter)) != NULL) {
> +               while ((sub_str = strsep(&tmp_str, delimiter)) && *sub_str) {
>                         ret = kstrtol(sub_str, 0, &parameter[parameter_size]);
>                         if (ret)
>                                 return -EINVAL;
>                         parameter_size++;
> +
> +                       if (!tmp_str)
> +                               break;
>                         while (isspace(*tmp_str))
>                                 tmp_str++;
>                 }
> --
> 2.25.1
>
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