5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Murad Masimov <m.masimov@xxxxxxxxx>
[ Upstream commit de2bf507fabba9c0c678cf5ed54beb546f5ca29a ]
Negative temperatures are reported as large positive temperatures
due to missing sign extension from unsigned int to long. Cast unsigned
raw register values to signed before performing the calculations
to fix the problem.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Fixes: fff7b8ab2255 ("hwmon: add Texas Instruments TPS23861 driver")
Signed-off-by: Murad Masimov <m.masimov@xxxxxxxxx>
Message-ID: <20241121173604.2021-1-m.masimov@xxxxxxxxx>
[groeck: Updated subject and description]
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/hwmon/tps23861.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/hwmon/tps23861.c b/drivers/hwmon/tps23861.c
index 2148fd543bb4b..3b2e72ed38c57 100644
--- a/drivers/hwmon/tps23861.c
+++ b/drivers/hwmon/tps23861.c
@@ -132,7 +132,7 @@ static int tps23861_read_temp(struct tps23861_data *data, long *val)
if (err < 0)
return err;
- *val = (regval * TEMPERATURE_LSB) - 20000;
+ *val = ((long)regval * TEMPERATURE_LSB) - 20000;
return 0;
}
--
2.43.0
