| From | Ben Hutchings <> | Date | Thu, 11 Sep 2014 13:32:13 +0100 | Subject | [PATCH 3.2 036/131] hwmon: (lm78) Fix overflow problems seen when writing large temperature limits |
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3.2.63-rc1 review patch. If anyone has any objections, please let me know.
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From: Guenter Roeck <linux@roeck-us.net>
commit 1074d683a51f1aded3562add9ef313e75d557327 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.
Cc: Axel Lin <axel.lin@ingics.com> Reviewed-by: Axel Lin <axel.lin@ingics.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> [bwh: Backported to 3.2: adjust context] Signed-off-by: Ben Hutchings <ben@decadent.org.uk> --- drivers/hwmon/lm78.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/hwmon/lm78.c +++ b/drivers/hwmon/lm78.c @@ -102,7 +102,7 @@ static inline int FAN_FROM_REG(u8 val, i /* TEMP: mC (-128C to +127C) REG: 1C/bit, two's complement */ -static inline s8 TEMP_TO_REG(int val) +static inline s8 TEMP_TO_REG(long val) { int nval = SENSORS_LIMIT(val, -128000, 127000) ; return nval<0 ? (nval-500)/1000 : (nval+500)/1000;
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