4.19-stable review patch. If anyone has any objections, please let me know.
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From: Guenter Roeck linux@roeck-us.net
[ Upstream commit 5c1de37969b7bc0abcb20b86e91e70caebbd4f89 ]
DIV_ROUND_CLOSEST() after kstrtol() results in an underflow if a large negative number such as -9223372036854775808 is provided by the user. Fix it by reordering clamp_val() and DIV_ROUND_CLOSEST() operations.
Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/hwmon/w83627ehf.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/hwmon/w83627ehf.c b/drivers/hwmon/w83627ehf.c index ad68b6d9ff17..8da5f77b8987 100644 --- a/drivers/hwmon/w83627ehf.c +++ b/drivers/hwmon/w83627ehf.c @@ -1519,7 +1519,7 @@ store_target_temp(struct device *dev, struct device_attribute *attr, if (err < 0) return err;
- val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, 127); + val = DIV_ROUND_CLOSEST(clamp_val(val, 0, 127000), 1000);
mutex_lock(&data->update_lock); data->target_temp[nr] = val; @@ -1545,7 +1545,7 @@ store_tolerance(struct device *dev, struct device_attribute *attr, return err;
/* Limit the temp to 0C - 15C */ - val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, 15); + val = DIV_ROUND_CLOSEST(clamp_val(val, 0, 15000), 1000);
mutex_lock(&data->update_lock); if (sio_data->kind == nct6775 || sio_data->kind == nct6776) {