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Subject: media: ts2020: avoid integer overflows on 32 bit machines Author: Mauro Carvalho Chehab mchehab@s-opensource.com Date: Wed Jan 10 07:20:39 2018 -0500

Before this patch, when compiled for arm32, the signal strength were reported as:

Lock (0x1f) Signal= 4294908.66dBm C/N= 12.79dB

Because of a 32 bit integer overflow. After it, it is properly reported as:

Lock (0x1f) Signal= -58.64dBm C/N= 12.79dB

Cc: stable@vger.kernel.org Fixes: 0f91c9d6bab9 ("[media] TS2020: Calculate tuner gain correctly") Signed-off-by: Mauro Carvalho Chehab mchehab@s-opensource.com

drivers/media/dvb-frontends/ts2020.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)

---

diff --git a/drivers/media/dvb-frontends/ts2020.c b/drivers/media/dvb-frontends/ts2020.c index 07f1726a5774..c55882a8da06 100644 --- a/drivers/media/dvb-frontends/ts2020.c +++ b/drivers/media/dvb-frontends/ts2020.c @@ -368,7 +368,7 @@ static int ts2020_read_tuner_gain(struct dvb_frontend *fe, unsigned v_agc, gain2 = clamp_t(long, gain2, 0, 13); v_agc = clamp_t(long, v_agc, 400, 1100);

- *_gain = -(gain1 * 2330 + + *_gain = -((__s64)gain1 * 2330 + gain2 * 3500 + v_agc * 24 / 10 * 10 + 10000); @@ -386,7 +386,7 @@ static int ts2020_read_tuner_gain(struct dvb_frontend *fe, unsigned v_agc, gain3 = clamp_t(long, gain3, 0, 6); v_agc = clamp_t(long, v_agc, 600, 1600);

- *_gain = -(gain1 * 2650 + + *_gain = -((__s64)gain1 * 2650 + gain2 * 3380 + gain3 * 2850 + v_agc * 176 / 100 * 10 -