linux-kernel - [PATCH 3.17 116/319] media: m88ts2022: fix 32bit overflow on filter calc

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Message-Id: <20141112011011.770233890@linuxfoundation.org>
Date:	Wed, 12 Nov 2014 10:14:14 +0900
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Nibble Max <nibble.max@...il.com>,
	Antti Palosaari <crope@....fi>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>
Subject: [PATCH 3.17 116/319] media: m88ts2022: fix 32bit overflow on filter calc

3.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Antti Palosaari <crope@....fi>

commit f538e085138e519e25ae0828bd6c6e7492ce8ca4 upstream.

Maximum satellite symbol rate used is 45000000Sps which overflows
when multiplied by 135. As final calculation result is fraction,
we could use mult_frac macro in order to keep calculation inside
32 bit number limits and prevent overflow.

Original bug and fix was provided by Nibble Max. I decided to
implement it differently as it is now.

Reported-by: Nibble Max <nibble.max@...il.com>
Tested-by: Nibble Max <nibble.max@...il.com>
Signed-off-by: Antti Palosaari <crope@....fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@...sung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/media/tuners/m88ts2022.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/media/tuners/m88ts2022.c
+++ b/drivers/media/tuners/m88ts2022.c
@@ -314,7 +314,7 @@ static int m88ts2022_set_params(struct d
 	div_min = gdiv28 * 78 / 100;
 	div_max = clamp_val(div_max, 0U, 63U);
 
-	f_3db_hz = c->symbol_rate * 135UL / 200UL;
+	f_3db_hz = mult_frac(c->symbol_rate, 135, 200);
 	f_3db_hz +=  2000000U + (frequency_offset_khz * 1000U);
 	f_3db_hz = clamp(f_3db_hz, 7000000U, 40000000U);
 


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