[PATCH 3.16 053/129] rtc: pm8xxx: fix unintended sign extension

[Ben Hutchings]

3.16.70-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Colin Ian King <colin.king@xxxxxxxxxxxxx>

commit e42280886018c6f77f0a90190f7cba344b0df3e0 upstream.

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@xxxxxxxxxxxxx>
Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 drivers/rtc/rtc-pm8xxx.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/rtc/rtc-pm8xxx.c
+++ b/drivers/rtc/rtc-pm8xxx.c
@@ -175,7 +175,8 @@ static int pm8xxx_rtc_read_time(struct d
 		}
 	}
 
-	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);
 
@@ -253,7 +254,8 @@ static int pm8xxx_rtc_read_alarm(struct
 		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);