rtc: 88pm80x: fix unintended sign extension

[ Upstream commit fb0b322537a831b5b0cb948c56f8f958ce493d3a ]

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#714646-714649 ("Unintended sign extension")

Fixes: 2985c29c1964 ("rtc: Add rtc support to 88PM80X PMIC")
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-88pm80x.c b/drivers/rtc/rtc-88pm80x.c
index 466bf7f9a285a5c455a26d199083384d93a4e121..7da2a1fb50f8999dd7df52eb056a83fee0b2a1c6 100644 (file)
--- a/drivers/rtc/rtc-88pm80x.c
+++ b/drivers/rtc/rtc-88pm80x.c
@@ -116,12 +116,14 @@ static int pm80x_rtc_read_time(struct device *dev, struct rtc_time *tm)
        unsigned char buf[4];
        unsigned long ticks, base, data;
        regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4);
-       base = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
+       base = ((unsigned long)buf[3] << 24) | (buf[2] << 16) |
+               (buf[1] << 8) | buf[0];
        dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]);
 
        /* load 32-bit read-only counter */
        regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4);
-       data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
+       data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) |
+               (buf[1] << 8) | buf[0];
        ticks = base + data;
        dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
                base, data, ticks);
@@ -144,7 +146,8 @@ static int pm80x_rtc_set_time(struct device *dev, struct rtc_time *tm)
 
        /* load 32-bit read-only counter */
        regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4);
-       data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
+       data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) |
+               (buf[1] << 8) | buf[0];
        base = ticks - data;
        dev_dbg(info->dev, "set base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
                base, data, ticks);
@@ -165,11 +168,13 @@ static int pm80x_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
        int ret;
 
        regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4);
-       base = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
+       base = ((unsigned long)buf[3] << 24) | (buf[2] << 16) |
+               (buf[1] << 8) | buf[0];
        dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]);
 
        regmap_raw_read(info->map, PM800_RTC_EXPIRE1_1, buf, 4);
-       data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
+       data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) |
+               (buf[1] << 8) | buf[0];
        ticks = base + data;
        dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
                base, data, ticks);
@@ -192,12 +197,14 @@ static int pm80x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
        regmap_update_bits(info->map, PM800_RTC_CONTROL, PM800_ALARM1_EN, 0);
 
        regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4);
-       base = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
+       base = ((unsigned long)buf[3] << 24) | (buf[2] << 16) |
+               (buf[1] << 8) | buf[0];
        dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]);
 
        /* load 32-bit read-only counter */
        regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4);
-       data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
+       data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) |
+               (buf[1] << 8) | buf[0];
        ticks = base + data;
        dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
                base, data, ticks);