linux-kernel - [patch] iio: dac: ad5592r: Off by one bug in ad5592r_alloc

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Message-ID: <20160429090330.GB18656@mwanda>
Date:	Fri, 29 Apr 2016 12:03:31 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Lars-Peter Clausen <lars@...afoo.de>
Cc:	Michael Hennerich <Michael.Hennerich@...log.com>,
	Jonathan Cameron <jic23@...nel.org>,
	Hartmut Knaack <knaack.h@....de>,
	Peter Meerwald-Stadler <pmeerw@...erw.net>,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch] iio: dac: ad5592r: Off by one bug in ad5592r_alloc_channels()

The > here should be >= or we go beyond the end for the array.

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

diff --git a/drivers/iio/dac/ad5592r-base.c b/drivers/iio/dac/ad5592r-base.c
index 948f600..69bde59 100644
--- a/drivers/iio/dac/ad5592r-base.c
+++ b/drivers/iio/dac/ad5592r-base.c
@@ -525,7 +525,7 @@ static int ad5592r_alloc_channels(struct ad5592r_state *st)
 
 	device_for_each_child_node(st->dev, child) {
 		ret = fwnode_property_read_u32(child, "reg", &reg);
-		if (ret || reg > ARRAY_SIZE(st->channel_modes))
+		if (ret || reg >= ARRAY_SIZE(st->channel_modes))
 			continue;
 
 		ret = fwnode_property_read_u32(child, "adi,mode", &tmp);