linux-kernel - [PATCH 3.13 143/187] hwmon: (sis5595) Prevent overflow problem when writing large limits

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Message-Id: <1410818997-9432-144-git-send-email-kamal@canonical.com>
Date:	Mon, 15 Sep 2014 15:09:13 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Axel Lin <axel.lin@...ics.com>, Guenter Roeck <linux@...ck-us.net>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13 143/187] hwmon: (sis5595) Prevent overflow problem when writing large limits

3.13.11.7 -stable 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: Kamal Mostafa <kamal@...onical.com>
---
 drivers/hwmon/sis5595.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwmon/sis5595.c b/drivers/hwmon/sis5595.c
index 72a8897..9ec7d2e 100644
--- a/drivers/hwmon/sis5595.c
+++ b/drivers/hwmon/sis5595.c
@@ -159,7 +159,7 @@ 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 = clamp_val(val, -54120, 157530) ;
 	return nval < 0 ? (nval - 5212 - 415) / 830 : (nval - 5212 + 415) / 830;
-- 
1.9.1

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