linux-kernel - [PATCH] iio: stx104: Store channel output state values as int

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Message-ID: <20160713144334.GA24521@sophia>
Date:	Wed, 13 Jul 2016 10:43:34 -0400
From:	William Breathitt Gray <vilhelm.gray@...il.com>
To:	jic23@...nel.org, knaack.h@....de, lars@...afoo.de,
	pmeerw@...erw.net
Cc:	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] iio: stx104: Store channel output state values as int

The val parameter has a data type of int in the read_raw and write_raw
callbacks. The chan_out_states array should have elements of type int in
order to match the data type of the val parameter.

This patch fixes a possible integer overflow condition when the the int
pointer val is dereferenced to store the unsigned int chan_out_states
element in the read_raw callback.

Fixes: 97a445dad37a ("iio: Add IIO support for the DAC on the Apex Embedded Systems STX104")
Signed-off-by: William Breathitt Gray <vilhelm.gray@...il.com>
---
 drivers/iio/dac/stx104.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/dac/stx104.c b/drivers/iio/dac/stx104.c
index 792a971..b22b744 100644
--- a/drivers/iio/dac/stx104.c
+++ b/drivers/iio/dac/stx104.c
@@ -47,7 +47,7 @@ MODULE_PARM_DESC(base, "Apex Embedded Systems STX104 base addresses");
  * @base:		base port address of the IIO device
  */
 struct stx104_iio {
-	unsigned chan_out_states[STX104_NUM_CHAN];
+	int chan_out_states[STX104_NUM_CHAN];
 	unsigned base;
 };
 
-- 
2.7.3