From: Dan Carpenter <dan.carpenter@oracle.com>
To: Mauro Carvalho Chehab <mchehab@infradead.org>
Cc: "Igor M. Liplianin" <liplianin@me.by>,
linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
kernel-janitors@vger.kernel.org
Subject: [patch 2/2] [media] ds3000: off by one in ds3000_read_snr()
Date: Tue, 17 Jan 2012 10:30:22 +0300 [thread overview]
Message-ID: <20120117073021.GB11358@elgon.mountain> (raw)
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@oracle.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);
next reply other threads:[~2012-01-17 7:30 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-17 7:30 Dan Carpenter [this message]
2012-01-18 17:06 ` [patch 2/2] [media] ds3000: off by one in ds3000_read_snr() walter harms
2012-01-19 9:33 ` Dan Carpenter
2012-01-19 10:26 ` walter harms
2012-01-19 12:22 ` Dan Carpenter
2012-01-21 15:58 ` Dan Carpenter
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