rtc: pm8xxx: fix unintended sign extension

[ Upstream commit e42280886018c6f77f0a90190f7cba344b0df3e0 ]

Shifting a u8 by 24 will cause the value to be promoted to an integer. If
the top bit of the u8 is set then the following conversion to an unsigned
long will sign extend the value causing the upper 32 bits to be set in
the result.

Fix this by casting the u8 value to an unsigned long before the shift.

Detected by CoverityScan, CID#1309693 ("Unintended sign extension")

Fixes: 9a9a54ad7aa2 ("drivers/rtc: add support for Qualcomm PMIC8xxx RTC")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/rtc/rtc-pm8xxx.c b/drivers/rtc/rtc-pm8xxx.c
index fac835530671ff003657a5807f750a73586be87e..a1b4b0ed1f1961c2ca0caef3076d6dae131798dc 100644 (file)
--- a/drivers/rtc/rtc-pm8xxx.c
+++ b/drivers/rtc/rtc-pm8xxx.c
@@ -186,7 +186,8 @@ static int pm8xxx_rtc_read_time(struct device *dev, struct rtc_time *tm)
                }
        }
 
-       secs = value[0] | (value[1] << 8) | (value[2] << 16) | (value[3] << 24);
+       secs = value[0] | (value[1] << 8) | (value[2] << 16) |
+              ((unsigned long)value[3] << 24);
 
        rtc_time_to_tm(secs, tm);
 
@@ -267,7 +268,8 @@ static int pm8xxx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
                return rc;
        }
 
-       secs = value[0] | (value[1] << 8) | (value[2] << 16) | (value[3] << 24);
+       secs = value[0] | (value[1] << 8) | (value[2] << 16) |
+              ((unsigned long)value[3] << 24);
 
        rtc_time_to_tm(secs, &alarm->time);