2.6.33-longterm review patch. If anyone has any objections, please let us know.
------------------
From: Vivien Didelot <vivien.dide...@savoirfairelinux.com>
commit ccd32e735de7a941906e093f8dca924bb05c5794 upstream.
An integer overflow occurs in the calculation of RHlinear when the
relative humidity is greater than around 30%. The consequence is a subtle
(but noticeable) error in the resulting humidity measurement.
Signed-off-by: Vivien Didelot <vivien.dide...@savoirfairelinux.com>
Signed-off-by: Jean Delvare <kh...@linux-fr.org>
Cc: Jonathan Cameron <ji...@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gre...@suse.de>
---
drivers/hwmon/sht15.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/hwmon/sht15.c
+++ b/drivers/hwmon/sht15.c
@@ -332,11 +332,11 @@ static inline int sht15_calc_humid(struc
const int c1 = -4;
const int c2 = 40500; /* x 10 ^ -6 */
- const int c3 = -2800; /* x10 ^ -9 */
+ const int c3 = -28; /* x 10 ^ -7 */
RHlinear = c1*1000
+ c2 * data->val_humid/1000
- + (data->val_humid * data->val_humid * c3)/1000000;
+ + (data->val_humid * data->val_humid * c3) / 10000;
return (temp - 25000) * (10000 + 80 * data->val_humid)
/ 1000000 + RHlinear;
}
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