From: Luiz Angelo Daros de Luca Date: Tue, 28 Jul 2026 00:22:24 +0000 (-0300) Subject: hwmon: (adt7470) Fix PWM auto temp state array and bounds check X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=92413f439d1ec5e55b73ede8d66a7b971cbd1ced;p=thirdparty%2Flinux.git hwmon: (adt7470) Fix PWM auto temp state array and bounds check In pwm_auto_temp_store(), the parsed user input was missing bounds checks, allowing values > 0xF to overflow into the adjacent channel's bits. Furthermore, the value was being incorrectly written to the pwm_automatic state array instead of pwm_auto_temp. Fix this by rejecting values > 0xF with -EINVAL, and assigning the value to the correct array only after a successful I2C write. Reported-by: sashiko-bot@kernel.org Closes: https://lore.kernel.org/all/20260727034932.0B7C41F000E9@smtp.kernel.org/#t Fixes: 6f9703d0be16 ("hwmon: add support for adt7470") Signed-off-by: Luiz Angelo Daros de Luca Link: https://lore.kernel.org/r/20260727-adt7470_fixes-v2-8-598e38a46ba6@gmail.com Signed-off-by: Guenter Roeck --- diff --git a/drivers/hwmon/adt7470.c b/drivers/hwmon/adt7470.c index 772d2a409bb5..c45b984c02e6 100644 --- a/drivers/hwmon/adt7470.c +++ b/drivers/hwmon/adt7470.c @@ -1049,8 +1049,10 @@ static ssize_t pwm_auto_temp_store(struct device *dev, if (temp < 0) return temp; + if (temp > 0xF) + return -EINVAL; + mutex_lock(&data->lock); - data->pwm_automatic[attr->index] = temp; if (!(attr->index % 2)) { mask = 0xF0; @@ -1061,6 +1063,9 @@ static ssize_t pwm_auto_temp_store(struct device *dev, } err = regmap_update_bits(data->regmap, pwm_auto_reg, mask, val); + if (!err) + data->pwm_auto_temp[attr->index] = temp; + mutex_unlock(&data->lock); return err < 0 ? err : count;