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| author | Guenter Roeck <linux@roeck-us.net> | 2014-07-29 20:48:59 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-09-05 16:28:35 -0700 |
| commit | 070d6526cc0b0402c44868b31957d39b5d40cdd2 (patch) | |
| tree | a185abec0d42110fa229740a27074f2cd4d6e168 /drivers/hwmon | |
| parent | 5fafb69d9854a1b38ff0fe1b0058544b94702871 (diff) | |
| download | linux-3.10-070d6526cc0b0402c44868b31957d39b5d40cdd2.tar.gz linux-3.10-070d6526cc0b0402c44868b31957d39b5d40cdd2.tar.bz2 linux-3.10-070d6526cc0b0402c44868b31957d39b5d40cdd2.zip | |
hwmon: (lm78) Fix overflow problems seen when writing large temperature limits
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwmon')
| -rw-r--r-- | drivers/hwmon/lm78.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/hwmon/lm78.c b/drivers/hwmon/lm78.c index a2f3b4a365e..b879427e9a4 100644 --- a/drivers/hwmon/lm78.c +++ b/drivers/hwmon/lm78.c @@ -108,7 +108,7 @@ static inline int FAN_FROM_REG(u8 val, int div) * 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 = clamp_val(val, -128000, 127000) ; return nval < 0 ? (nval - 500) / 1000 : (nval + 500) / 1000; |