linux-kernel - [PATCH] time: Fix overwrite err unexpected in clock

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Date:   Mon, 12 Apr 2021 12:45:51 +0000
From:   Chen Jun <chenjun102@...wei.com>
To:     <linux-kernel@...r.kernel.org>
CC:     <tglx@...utronix.de>, <richardcochran@...il.com>,
        <johnstul@...ibm.com>, <rui.xiang@...wei.com>
Subject: [PATCH] time: Fix overwrite err unexpected in clock_adjtime32

the correct error is covered by put_old_timex32.

Fixes: f1f1d5ebd10f ("posix-timers: Introduce a syscall for clock tuning.")
Signed-off-by: Chen Jun <chenjun102@...wei.com>
---
 kernel/time/posix-timers.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index bf540f5a..dd5697d 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -1191,8 +1191,8 @@ SYSCALL_DEFINE2(clock_adjtime32, clockid_t, which_clock,
 
 	err = do_clock_adjtime(which_clock, &ktx);
 
-	if (err >= 0)
-		err = put_old_timex32(utp, &ktx);
+	if (err >= 0 && put_old_timex32(utp, &ktx))
+		return -EFAULT;
 
 	return err;
 }
-- 
2.9.4