Add check for out of bounds condition when clients perform cache
operations on the System ION heap. Return error if client
tries to do a cache operation outside the valid range.
Also add check to make sure we don't dereference a null-pointer
when converting a page to its physical address.
Change-Id: Idacff0f36a9d872485e7e74ee1a355ec1e33fb2c
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>
c57a61ec5e