This is a note to let you know that I've just added the patch titled
media: m88ts2022: fix 32bit overflow on filter calc
to the 3.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
media-m88ts2022-fix-32bit-overflow-on-filter-calc.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From f538e085138e519e25ae0828bd6c6e7492ce8ca4 Mon Sep 17 00:00:00 2001
From: Antti Palosaari <[email protected]>
Date: Thu, 21 Aug 2014 14:02:27 -0300
Subject: media: m88ts2022: fix 32bit overflow on filter calc
From: Antti Palosaari <[email protected]>
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 <[email protected]>
Tested-by: Nibble Max <[email protected]>
Signed-off-by: Antti Palosaari <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
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);
Patches currently in stable-queue which might be from [email protected] are
queue-3.17/media-m88ts2022-fix-32bit-overflow-on-filter-calc.patch
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