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| author | Colin Ian King <colin.king@canonical.com> | 2020-11-05 11:50:19 +0000 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2020-12-02 17:42:23 -0800 |
| commit | 90673f713fceaa50eef1bff0bcc8ee4e6fbc8953 (patch) | |
| tree | 861b45f2f5b84e96ccaf80ab470bdcfe8422d9f0 | |
| parent | d115b51e0e567199c821fc39e13b6af7e78f247d (diff) | |
| download | linux-stable-90673f713fceaa50eef1bff0bcc8ee4e6fbc8953.tar.gz linux-stable-90673f713fceaa50eef1bff0bcc8ee4e6fbc8953.tar.bz2 linux-stable-90673f713fceaa50eef1bff0bcc8ee4e6fbc8953.zip | |
hwmon: (corsair-psu) fix unintentional sign extension issue
The shifting of the u8 integer data[3] by 24 bits to the left will
be promoted to a 32 bit signed int and then sign-extended to a
long. In the event that the top bit of data[3] is set then all
then all the upper 32 bits of a 64 bit long end up as also being
set because of the sign-extension. Fix this by casting data[3] to
a long before the shift.
Addresses-Coverity: ("Unintended sign extension")
Fixes: ce15cd2cee8b ("hwmon: add Corsair PSU HID controller driver")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20201105115019.41735-1-colin.king@canonical.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
| -rw-r--r-- | drivers/hwmon/corsair-psu.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/hwmon/corsair-psu.c b/drivers/hwmon/corsair-psu.c index e92d0376e7ac..5d19a888231a 100644 --- a/drivers/hwmon/corsair-psu.c +++ b/drivers/hwmon/corsair-psu.c @@ -241,7 +241,7 @@ static int corsairpsu_get_value(struct corsairpsu_data *priv, u8 cmd, u8 rail, l * the LINEAR11 conversion are the watts values which are about 1200 for the strongest psu * supported (HX1200i) */ - tmp = (data[3] << 24) + (data[2] << 16) + (data[1] << 8) + data[0]; + tmp = ((long)data[3] << 24) + (data[2] << 16) + (data[1] << 8) + data[0]; switch (cmd) { case PSU_CMD_IN_VOLTS: case PSU_CMD_IN_AMPS: |