time: adjtimex: Validate the ADJ_FREQUENCY values
commit09ee0cd0c2072c353bc3c096b36267bfeb0a8a9f
authorSasha Levin <sasha.levin@oracle.com>
Thu, 4 Dec 2014 00:25:05 +0000 (3 19:25 -0500)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 30 Jan 2015 01:40:49 +0000 (29 17:40 -0800)
tree2f27adae9c5c9939b4e9af669d913de7d3d117b2
parent5fea291eddb2b2721874c860783e0516df3ad699
time: adjtimex: Validate the ADJ_FREQUENCY values

commit 5e5aeb4367b450a28f447f6d5ab57d8f2ab16a5f upstream.

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>
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
kernel/time/ntp.c