commit d39a743511cdb80884b4b9cd506fe84b6b08e66e
author Richard Cochran <richardcochran@gmail.com> Sun Apr 27 15:01:27 2014 +0200
committer David S. Miller <davem@davemloft.net> Mon Apr 28 13:28:43 2014 -0400
tree 708d00e333ca4096af001a5ad2b8dfc250f254ab
parent 5a2b646ffe21e6014314b4d1df040e2553e39a3b

ptp: validate the requested frequency adjustment.

PTP Hardware Clock drivers specify a maximum frequency adjustment that
their clocks can accommodate. Normally, user space programs will want to
respect the advertised limits. However, no kernel or driver code checks
that the dialed frequency offset is within the bounds, and out of range
values can lead to surprising results.

This patch fixes the issue by rejecting bad values.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>