time: adjtimex: Validate the ADJ_FREQUENCY values
authorSasha Levin <sasha.levin@oracle.com>
Thu, 4 Dec 2014 00:25:05 +0000 (19:25 -0500)
committerJohn Stultz <john.stultz@linaro.org>
Wed, 7 Jan 2015 17:50:32 +0000 (09:50 -0800)
Verify that the frequency value from userspace is valid and makes sense.

Unverified values can cause overflows later on.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
[jstultz: Fix up bug for negative values and drop redunent cap check]
Signed-off-by: John Stultz <john.stultz@linaro.org>
kernel/time/ntp.c

Simple merge