linux-kernel - [PATCH] time: fix a missing check of rtc_read

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Message-Id: <20181226041319.73854-1-kjlu@umn.edu>
Date:   Tue, 25 Dec 2018 22:13:18 -0600
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Thomas Gleixner <tglx@...utronix.de>,
        John Stultz <john.stultz@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>, linux-kernel@...r.kernel.org
Subject: [PATCH] time: fix a missing check of rtc_read_time

When rtc_read_time fails, we shouldn't use it read time. The fix returns
with its error code when it fails.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 kernel/time/alarmtimer.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index fa5de5e8de61..19ba8a1633e0 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -293,7 +293,9 @@ static int alarmtimer_suspend(struct device *dev)
 
 	/* Setup an rtc timer to fire that far in the future */
 	rtc_timer_cancel(rtc, &rtctimer);
-	rtc_read_time(rtc, &tm);
+	ret = rtc_read_time(rtc, &tm);
+	if (ret < 0)
+		return ret;
 	now = rtc_tm_to_ktime(tm);
 	now = ktime_add(now, min);
 
-- 
2.17.2 (Apple Git-113)