[alsa-devel] Applied "ASoC: cx2072x: fix integer overflow on unsigned int multiply" to the asoc tree

[Mark Brown]

The patch

   ASoC: cx2072x: fix integer overflow on unsigned int multiply

has been applied to the asoc tree at

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-5.3

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

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and review of the tree, please engage with people reporting problems and
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If any updates are required or you are submitting further changes they
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patches will not be replaced.

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Thanks,
Mark

>From be0461048b60066eaba9046178fb96e78579af21 Mon Sep 17 00:00:00 2001
From: Colin Ian King <colin.king at canonical.com>
Date: Fri, 24 May 2019 23:25:51 +0100
Subject: [PATCH] ASoC: cx2072x: fix integer overflow on unsigned int multiply

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 at canonical.com>
Reviewed-by: Takashi Iwai <tiwai at suse.de>
Signed-off-by: Mark Brown <broonie at kernel.org>
---
 sound/soc/codecs/cx2072x.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/codecs/cx2072x.c b/sound/soc/codecs/cx2072x.c
index c11a585bbf70..ed762546eaee 100644
--- a/sound/soc/codecs/cx2072x.c
+++ b/sound/soc/codecs/cx2072x.c
@@ -627,7 +627,7 @@ static int cx2072x_config_pll(struct cx2072x_priv *cx2072x)
 	if (frac_div) {
 		frac_div *= 1000;
 		frac_div /= pll_input;
-		frac_num = ((4000 + frac_div) * ((1 << 20) - 4));
+		frac_num = (u64)(4000 + frac_div) * ((1 << 20) - 4);
 		do_div(frac_num, 7);
 		frac = ((u32)frac_num + 499) / 1000;
 	}
-- 
2.20.1