linux-kernel - Re: [PATCH] drm/amd/display/dc/dce: Fix multiple potential integer overflows

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Date:   Wed, 4 Jul 2018 14:05:18 -0400
From:   Harry Wentland <harry.wentland@....com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Michel Dänzer <michel@...nzer.net>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "David (ChunMing) Zhou" <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>
Cc:     amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/amd/display/dc/dce: Fix multiple potential integer
 overflows

On 2018-07-04 01:54 PM, Gustavo A. R. Silva wrote:
> 
> 
> On 07/04/2018 12:51 PM, Harry Wentland wrote:
> [..]
>>>>  
>>>> @@ -145,8 +145,8 @@ static bool calculate_fb_and_fractional_fb_divider(
>>>>   * of fractional feedback decimal point and the fractional FB Divider precision
>>>>   * is 2 then the equation becomes (ullfeedbackDivider + 5*100) / (10*100))*/
>>>>  
>>>> -	feedback_divider += (uint64_t)
>>>> -			(5 * calc_pll_cs->fract_fb_divider_precision_factor);
>>>> +	feedback_divider += 5UL *
>>>> +			    calc_pll_cs->fract_fb_divider_precision_factor;
>>>
>>> This should be 5ULL, as the commit log says, otherwise it's still only
>>> 32 bits on 32-bit platforms.
>>>
>>
>> Agreed.
>>
>> Otherwise this looks good.
>>
>> With that fixed this patch is
>> Reviewed-by: Harry Wentland <harry.wentland@....com>
>>
> 
> Hi Harry,
> 
> I already sent v2: https://patchwork.kernel.org/patch/10506897/
> 

Thanks. Merged.

Harry

> Thanks
> --
> Gustavo
>