linux-kernel - Re: [PATCH] ASoC: max98090: Remove unneeded check in max98090_put_enab

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Message-ID: <YoZ+dmprwb5Ohto3@sirena.org.uk>
Date:   Thu, 19 May 2022 18:29:26 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Alexey Khoroshilov <khoroshilov@...ras.ru>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: Re: [PATCH] ASoC: max98090: Remove unneeded check in
 max98090_put_enab_tlv()

On Thu, May 19, 2022 at 08:10:12PM +0300, Alexey Khoroshilov wrote:
> Variable sel is of unsigned int type, so sel < 0 is not required.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.

>  	val = (val >> mc->shift) & mask;
>  
> -	if (sel < 0 || sel > mc->max)
> +	if (sel > mc->max)

The check needs to be moved, not removed.  The userspace ABI allows
passing in of negative values.

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