linux-kernel - Re: [PATCH][next] drm/mgag200: Fix uninitialized variable delta

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Date:   Tue, 17 Aug 2021 20:22:31 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Colin King <colin.king@...onical.com>,
        Dave Airlie <airlied@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Sam Ravnborg <sam@...nborg.org>,
        dri-devel@...ts.freedesktop.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] drm/mgag200: Fix uninitialized variable delta

Hi

Am 17.08.21 um 18:32 schrieb Colin King:
> From: Colin Ian King <colin.king@...onical.com>
> 
> The variable delta is not initialized and this will cause unexpected
> behaviour with the comparison of tmpdelta < delta. Fix this by setting
> it to 0xffffffff. This matches the behaviour as in the similar function
> mgag200_pixpll_compute_g200se_04.
> 
> Addresses-Coverity: ("Uninitialized scalar variable")
> Fixes: 2545ac960364 ("drm/mgag200: Abstract pixel PLL via struct mgag200_pll")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Reviewed-by: Thomas Zimmermann <tzimmermann@...e.de>

But the commit message needs Fixes etc. I just sent out a patch for this 
issue myself. I'd like to merge both patches' tags and commit the result 
under your name. (You were first.) Is that ok for you?

Best regards
Thomas

> ---
>   drivers/gpu/drm/mgag200/mgag200_pll.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/mgag200/mgag200_pll.c b/drivers/gpu/drm/mgag200/mgag200_pll.c
> index 7c903cf19c0d..18f1a6dd019a 100644
> --- a/drivers/gpu/drm/mgag200/mgag200_pll.c
> +++ b/drivers/gpu/drm/mgag200/mgag200_pll.c
> @@ -125,6 +125,7 @@ static int mgag200_pixpll_compute_g200se_00(struct mgag200_pll *pixpll, long clo
>   
>   	m = n = p = s = 0;
>   	permitteddelta = clock * 5 / 1000;
> +	delta = 0xffffffff;
>   
>   	for (testp = 8; testp > 0; testp /= 2) {
>   		if (clock * testp > vcomax)
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer



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