linux-kernel - [PATCH 3.2 050/131] hwmon: (sis5595) Prevent overflow problem when writing large limits

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Message-ID: <lsq.1410438733.384398996@decadent.org.uk>
Date:	Thu, 11 Sep 2014 13:32:13 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Guenter Roeck" <linux@...ck-us.net>,
	"Axel Lin" <axel.lin@...ics.com>
Subject: [PATCH 3.2 050/131] hwmon: (sis5595) Prevent overflow problem
 when writing large limits

3.2.63-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Axel Lin <axel.lin@...ics.com>

commit cc336546ddca8c22de83720632431c16a5f9fe9a upstream.

On platforms with sizeof(int) < sizeof(long), writing a temperature
limit larger than MAXINT will result in unpredictable limit values
written to the chip. Avoid auto-conversion from long to int to fix
the problem.

Signed-off-by: Axel Lin <axel.lin@...ics.com>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/hwmon/sis5595.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/hwmon/sis5595.c
+++ b/drivers/hwmon/sis5595.c
@@ -149,7 +149,7 @@ static inline int TEMP_FROM_REG(s8 val)
 {
 	return val * 830 + 52120;
 }
-static inline s8 TEMP_TO_REG(int val)
+static inline s8 TEMP_TO_REG(long val)
 {
 	int nval = SENSORS_LIMIT(val, -54120, 157530) ;
 	return nval<0 ? (nval-5212-415)/830 : (nval-5212+415)/830;

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