This is a note to let you know that I've just added the patch titled posix-timers: Preserve return value in clock_adjtime32() to the 4.19-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: posix-timers-preserve-return-value-in-clock_adjtime32.patch and it can be found in the queue-4.19 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 2d036dfa5f10df9782f5278fc591d79d283c1fad Mon Sep 17 00:00:00 2001 From: Chen Jun <chenjun102@xxxxxxxxxx> Date: Wed, 14 Apr 2021 03:04:49 +0000 Subject: posix-timers: Preserve return value in clock_adjtime32() From: Chen Jun <chenjun102@xxxxxxxxxx> 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@xxxxxxxxxx> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Reviewed-by: Richard Cochran <richardcochran@xxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx Link: https://lore.kernel.org/r/20210414030449.90692-1-chenjun102@xxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- kernel/time/posix-timers.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/kernel/time/posix-timers.c +++ b/kernel/time/posix-timers.c @@ -1166,8 +1166,8 @@ COMPAT_SYSCALL_DEFINE2(clock_adjtime, cl 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; } Patches currently in stable-queue which might be from chenjun102@xxxxxxxxxx are queue-4.19/posix-timers-preserve-return-value-in-clock_adjtime32.patch