linux-kernel - [PATCH 3.12 33/56] hwmon: (gpio-fan) Prevent overflow problem when writing large limits

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Date:	Wed,  3 Sep 2014 11:26:52 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Axel Lin <axel.lin@...ics.com>,
	Guenter Roeck <linux@...ck-us.net>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 33/56] hwmon: (gpio-fan) Prevent overflow problem when writing large limits

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

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 2565fb05d1e9fc0831f7b1c083bcfcb1cba1f020 upstream.

On platforms with sizeof(int) < sizeof(unsigned long), writing a rpm value
larger than MAXINT will result in unpredictable limit values written to the
chip. Avoid auto-conversion from unsigned 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: Jiri Slaby <jslaby@...e.cz>
---
 drivers/hwmon/gpio-fan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwmon/gpio-fan.c b/drivers/hwmon/gpio-fan.c
index b7d6a5704eb2..ee21bdd610ee 100644
--- a/drivers/hwmon/gpio-fan.c
+++ b/drivers/hwmon/gpio-fan.c
@@ -172,7 +172,7 @@ static int get_fan_speed_index(struct gpio_fan_data *fan_data)
 	return -EINVAL;
 }
 
-static int rpm_to_speed_index(struct gpio_fan_data *fan_data, int rpm)
+static int rpm_to_speed_index(struct gpio_fan_data *fan_data, unsigned long rpm)
 {
 	struct gpio_fan_speed *speed = fan_data->speed;
 	int i;
-- 
2.1.0

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