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time: Make settimeofday error checking work again

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In commit 86d3473224 some of the checking for a valid timeval
was subtley changed which caused -EINVAL to be returned whenever
the timeval was null.

However, it is possible to set the timezone data while specifying
a NULL timeval, which is usually done to handle systems where the
RTC keeps local time instead of UTC. Thus the patch causes such
systems to have the time incorrectly set.

This patch addresses the issue by handling the error conditionals
in the same way as was done previously.

Fixes: 86d3473224 "time: Introduce do_sys_settimeofday64()"
Reported-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Baolin Wang <baolin.wang@linaro.org>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Shuah Khan <shuahkh@osg.samsung.com>
Link: http://lkml.kernel.org/r/1464807207-16530-2-git-send-email-john.stultz@linaro.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
John Stultz 2016-06-01 11:53:26 -07:00 committed by Thomas Gleixner
parent 1a695a905c
commit dfc2507b26
1 changed files with 3 additions and 0 deletions
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3
include/linux/timekeeping.h
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@ -21,6 +21,9 @@ static inline int do_sys_settimeofday(const struct timespec *tv,
struct timespec64 ts64;
if (!tv)
return do_sys_settimeofday64(NULL, tz);
if (!timespec_valid(tv))
return -EINVAL;
ts64 = timespec_to_timespec64(*tv);