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Message-Id: <2f8d1a117fe52498e3405a7a693d9aae1cfa4872.1409735865.git.jslaby@suse.cz>
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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