diff mbox

dvb-core: fix 32-bit overflow during bandwidth calculation

Message ID 1431623608-4749-1-git-send-email-crope@iki.fi (mailing list archive)
State New, archived
Headers show

Commit Message

Antti Palosaari May 14, 2015, 5:13 p.m. UTC 
Frontend bandwidth calculation overflows on very high DVB-S/S2
symbol rates. Use mult_frac() macro in order to keep calculation
correct.

Signed-off-by: Antti Palosaari <crope@iki.fi>
---
 drivers/media/dvb-core/dvb_frontend.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c
index 882ca41..a894d4c 100644
--- a/drivers/media/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb-core/dvb_frontend.c
@@ -2216,7 +2216,7 @@  static int dtv_set_frontend(struct dvb_frontend *fe)
 		break;
 	}
 	if (rolloff)
-		c->bandwidth_hz = (c->symbol_rate * rolloff) / 100;
+		c->bandwidth_hz = mult_frac(c->symbol_rate, rolloff, 100);
 
 	/* force auto frequency inversion if requested */
 	if (dvb_force_auto_inversion)