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| author |   Antti Palosaari <crope@iki.fi> | 2014-08-21 14:02:27 -0300 |
|---|---|---|
| committer |   Mauro Carvalho Chehab <m.chehab@samsung.com> | 2014-09-02 15:48:00 -0300 |
| commit | f538e085138e519e25ae0828bd6c6e7492ce8ca4 (patch) | |
| tree | 2d2262193d33ca153eb7128bdcf10f59fe975968 /drivers/media/tuners/m88ts2022.c | |
| parent | [media] msi2500: remove unneeded local pointer on msi2500_isoc_init() (diff) | |
| download | linux-dev-f538e085138e519e25ae0828bd6c6e7492ce8ca4.tar.xz linux-dev-f538e085138e519e25ae0828bd6c6e7492ce8ca4.zip | |
[media] m88ts2022: fix 32bit overflow on filter calc
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@gmail.com>
Tested-by: Nibble Max <nibble.max@gmail.com>
Cc: <stable@kernel.org>
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'drivers/media/tuners/m88ts2022.c')
| -rw-r--r-- | drivers/media/tuners/m88ts2022.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/media/tuners/m88ts2022.c b/drivers/media/tuners/m88ts2022.c index 40c42dec721b..7a62097aa9ea 100644 --- a/drivers/media/tuners/m88ts2022.c +++ b/drivers/media/tuners/m88ts2022.c @@ -314,7 +314,7 @@ static int m88ts2022_set_params(struct dvb_frontend *fe) 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); |