linux-kernel - Re: [PATCH][next] ASoC: cx2072x: fix integer overflow on unsigned int multiply

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Message-ID: <s5hlfyvaw55.wl-tiwai@suse.de>
Date:   Sat, 25 May 2019 08:25:10 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     "Colin King" <colin.king@...onical.com>
Cc:     <alsa-devel@...a-project.org>,
        "Liam Girdwood" <lgirdwood@...il.com>,
        "Mark Brown" <broonie@...nel.org>,
        "Jaroslav Kysela" <perex@...ex.cz>,
        <kernel-janitors@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next] ASoC: cx2072x: fix integer overflow on unsigned int multiply

On Sat, 25 May 2019 00:25:51 +0200,
Colin King wrote:
> 
> From: Colin Ian King <colin.king@...onical.com>
> 
> In the case where frac_div larger than 96 the result of an unsigned
> multiplication overflows an unsigned int.  For example, this can
> happen when the sample_rate is 192000 and pll_input is 122.  Fix
> this by casing the first term of the mutiply to a u64. Also remove
> the extraneous parentheses around the expression.
> 
> Addresses-Coverity: ("Unintentional integer overflow")
> Fixes: a497a4363706 ("ASoC: Add support for Conexant CX2072X CODEC")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Reviewed-by: Takashi Iwai <tiwai@...e.de>


thanks,

Takashi