| Message ID | 20240829084120.656973-1-chou.cosmo@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | [linux,dev-6.6] hwmon: (pt5161l) Fix invalid temperature reading | expand |
On Thu, 2024-08-29 at 16:41 +0800, Cosmo Chou wrote: > The temperature reading function was using a signed long for the ADC > code, which could lead to mishandling of invalid codes on 32-bit > platforms. This allowed out-of-range ADC codes to be incorrectly > interpreted as valid values and used in temperature calculations. > > Change adc_code to u32 to ensure that invalid ADC codes are correctly > identified on all platforms. > > Fixes: 1b2ca93cd059 ("hwmon: Add driver for Astera Labs PT5161L retimer") > Signed-off-by: Cosmo Chou <chou.cosmo@gmail.com> > --- > Link: https://lore.kernel.org/all/c16f3254-36c1-4ec3-ac09-ca15ed547413@roeck-us.net/ Thanks, I've backported the change from upstream directly. Andrew
diff --git a/drivers/hwmon/pt5161l.c b/drivers/hwmon/pt5161l.c index b0d58a26d499..a9f0b23f9e76 100644 --- a/drivers/hwmon/pt5161l.c +++ b/drivers/hwmon/pt5161l.c @@ -427,7 +427,7 @@ static int pt5161l_read(struct device *dev, enum hwmon_sensor_types type, struct pt5161l_data *data = dev_get_drvdata(dev); int ret; u8 buf[8]; - long adc_code; + u32 adc_code; switch (attr) { case hwmon_temp_input: @@ -449,7 +449,7 @@ static int pt5161l_read(struct device *dev, enum hwmon_sensor_types type, adc_code = buf[3] << 24 | buf[2] << 16 | buf[1] << 8 | buf[0]; if (adc_code == 0 || adc_code >= 0x3ff) { - dev_dbg(dev, "Invalid adc_code %lx\n", adc_code); + dev_dbg(dev, "Invalid adc_code %x\n", adc_code); return -EIO; }
The temperature reading function was using a signed long for the ADC code, which could lead to mishandling of invalid codes on 32-bit platforms. This allowed out-of-range ADC codes to be incorrectly interpreted as valid values and used in temperature calculations. Change adc_code to u32 to ensure that invalid ADC codes are correctly identified on all platforms. Fixes: 1b2ca93cd059 ("hwmon: Add driver for Astera Labs PT5161L retimer") Signed-off-by: Cosmo Chou <chou.cosmo@gmail.com> --- Link: https://lore.kernel.org/all/c16f3254-36c1-4ec3-ac09-ca15ed547413@roeck-us.net/ Change log: v2: - Fix build warnings of dev_dbg(). --- drivers/hwmon/pt5161l.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)