linux-kernel - [PATCH 1/8] y2038: timex: remove incorrect time

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Message-Id: <20191108203435.112759-2-arnd@arndb.de>
Date:   Fri,  8 Nov 2019 21:34:24 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     y2038@...ts.linaro.org, John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        stable@...r.kernel.org, Deepa Dinamani <deepa.kernel@...il.com>,
        linux-alpha@...r.kernel.org, netdev@...r.kernel.org,
        Stephen Boyd <sboyd@...nel.org>
Subject: [PATCH 1/8] y2038: timex: remove incorrect time_t truncation

A cast to 'time_t' was accidentally left in place during the
conversion of __do_adjtimex() to 64-bit timestamps, so the
resulting value is incorrectly truncated.

Remove the cast so the 64-bit time gets propagated correctly.

Cc: stable@...r.kernel.org
Fixes: ead25417f82e ("timex: use __kernel_timex internally")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 kernel/time/ntp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 65eb796610dc..069ca78fb0bf 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -771,7 +771,7 @@ int __do_adjtimex(struct __kernel_timex *txc, const struct timespec64 *ts,
 	/* fill PPS status fields */
 	pps_fill_timex(txc);
 
-	txc->time.tv_sec = (time_t)ts->tv_sec;
+	txc->time.tv_sec = ts->tv_sec;
 	txc->time.tv_usec = ts->tv_nsec;
 	if (!(time_status & STA_NANO))
 		txc->time.tv_usec = ts->tv_nsec / NSEC_PER_USEC;
-- 
2.20.0