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time: Make sure tz_minuteswest is set to a valid value when setting time

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Invalid values may overflow later, leading to undefined behaviour when
multiplied by 60 to get the amount of seconds.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
This commit is contained in:
Sasha Levin 2014-12-01 23:04:06 -05:00 committed by John Stultz
parent 4e3d9cb013
commit 6f7d79849a
1 changed files with 4 additions and 0 deletions
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4
kernel/time/time.c
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@ -173,6 +173,10 @@ int do_sys_settimeofday(const struct timespec *tv, const struct timezone *tz)
return error;
if (tz) {
/* Verify we're witin the +-15 hrs range */
if (tz->tz_minuteswest > 15*60 || tz->tz_minuteswest < -15*60)
return -EINVAL;
sys_tz = *tz;
update_vsyscall_tz();
if (firsttime) {