linux-kernel - [patch 2/2] [media] ds3000: off by one in ds3000_read

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Message-ID: <20120117073021.GB11358@elgon.mountain>
Date:	Tue, 17 Jan 2012 10:30:22 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Mauro Carvalho Chehab <mchehab@...radead.org>
Cc:	"Igor M. Liplianin" <liplianin@...by>, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [patch 2/2] [media] ds3000: off by one in ds3000_read_snr()

This is a static checker patch and I don't have the hardware to test
this, so please review it carefully.  The dvbs2_snr_tab[] array has 80
elements so when we cap it at 80, that's off by one.  I would have
assumed that the test was wrong but in the lines right before we have
the same test but use "snr_reading - 1" as the array offset.  I've done
the same thing here.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/drivers/media/dvb/frontends/ds3000.c b/drivers/media/dvb/frontends/ds3000.c
index af65d01..3f5ae0a 100644
--- a/drivers/media/dvb/frontends/ds3000.c
+++ b/drivers/media/dvb/frontends/ds3000.c
@@ -681,7 +681,7 @@ static int ds3000_read_snr(struct dvb_frontend *fe, u16 *snr)
 			snr_reading = dvbs2_noise_reading / tmp;
 			if (snr_reading > 80)
 				snr_reading = 80;
-			*snr = -(dvbs2_snr_tab[snr_reading] / 1000);
+			*snr = -(dvbs2_snr_tab[snr_reading - 1] / 1000);
 		}
 		dprintk("%s: raw / cooked = 0x%02x / 0x%04x\n", __func__,
 				snr_reading, *snr);
--
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