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authorColin Ian King <colin.king@canonical.com>2018-02-15 19:36:14 +0000
committerAlexandre Belloni <alexandre.belloni@bootlin.com>2018-03-01 10:49:38 +0100
commit347876ad47b9923ce26e686173bbf46581802ffa (patch)
treeef1cf730fd20beae4fc7cf58805624a678f4df0e
parente6a0b0f4085c9a56fa50c9666ee662d197c4707d (diff)
rtc: tx4939: avoid unintended sign extension on a 24 bit shift
The shifting of buf[5] by 24 bits to the left will be promoted to a 32 bit signed int and then sign-extended to an unsigned long. If the top bit of buf[5] is set then all then all the upper bits sec end up as also being set because of the sign-extension. Fix this by casting buf[5] to an unsigned long before the shift. Detected by CoverityScan, CID#1465292 ("Unintended sign extension") Fixes: 0e1492330cd2 ("rtc: add rtc-tx4939 driver") Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
-rw-r--r--drivers/rtc/rtc-tx4939.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/rtc/rtc-tx4939.c b/drivers/rtc/rtc-tx4939.c
index fcf837d50b70..3b83cdb0b828 100644
--- a/drivers/rtc/rtc-tx4939.c
+++ b/drivers/rtc/rtc-tx4939.c
@@ -109,7 +109,8 @@ static int tx4939_rtc_read_time(struct device *dev, struct rtc_time *tm)
for (i = 2; i < 6; i++)
buf[i] = __raw_readl(&rtcreg->dat);
spin_unlock_irq(&pdata->lock);
- sec = (buf[5] << 24) | (buf[4] << 16) | (buf[3] << 8) | buf[2];
+ sec = ((unsigned long)buf[5] << 24) | (buf[4] << 16) |
+ (buf[3] << 8) | buf[2];
rtc_time_to_tm(sec, tm);
return rtc_valid_tm(tm);
}
@@ -170,7 +171,8 @@ static int tx4939_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
alrm->enabled = (ctl & TX4939_RTCCTL_ALME) ? 1 : 0;
alrm->pending = (ctl & TX4939_RTCCTL_ALMD) ? 1 : 0;
spin_unlock_irq(&pdata->lock);
- sec = (buf[5] << 24) | (buf[4] << 16) | (buf[3] << 8) | buf[2];
+ sec = ((unsigned long)buf[5] << 24) | (buf[4] << 16) |
+ (buf[3] << 8) | buf[2];
rtc_time_to_tm(sec, &alrm->time);
return rtc_valid_tm(&alrm->time);
}