The following commit has been merged into the timers/core branch of tip:
Commit-ID: 2d036dfa5f10df9782f5278fc591d79d283c1fad Gitweb: https://git.kernel.org/tip/2d036dfa5f10df9782f5278fc591d79d283c1fad Author: Chen Jun chenjun102@huawei.com AuthorDate: Wed, 14 Apr 2021 03:04:49 Committer: Thomas Gleixner tglx@linutronix.de CommitterDate: Sat, 17 Apr 2021 14:55:06 +02:00
posix-timers: Preserve return value in clock_adjtime32()
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 --- 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 bf540f5..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; }