From c89fdf5261799df8952e42785ea8bcb115eefa26 Mon Sep 17 00:00:00 2001
From: Chen Jun <chenjun102@huawei.com>
Date: Wed, 30 Jun 2021 21:02:45 +0800
Subject: [PATCH] posix-timers: Preserve return value in clock_adjtime32()
stable inclusion
from linux-4.19.191
commit 1a852780d9d93378ae4f7d7d57213bc114c6873f
--------------------------------
commit 2d036dfa5f10df9782f5278fc591d79d283c1fad upstream.
The return value on success (>= 0) is overwritten by the return value of
put_old_timex32(). That works correct in the fault case, but is wrong for
the success case where put_old_timex32() returns 0.
Just check the return value of put_old_timex32() and return -EFAULT in case
it is not zero.
[ tglx: Massage changelog ]
Fixes: 3a4d44b61625 ("ntp: Move adjtimex related compat syscalls to native counterparts")
Signed-off-by: Chen Jun <chenjun102@huawei.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Richard Cochran <richardcochran@gmail.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210414030449.90692-1-chenjun102@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.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 977bb6b78b0c..b0bda93c595d 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -1174,8 +1174,8 @@ COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock,
err = kc->clock_adj(which_clock, &ktx);
- if (err >= 0)
- err = compat_put_timex(utp, &ktx);
+ if (err >= 0 && compat_put_timex(utp, &ktx))
+ return -EFAULT;
return err;
}
--
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