[PATCH OLK-6.6] fix mlock in OLK-6.6

From: Ma Wupeng mawupeng1@huawei.com

While testing mlock, we have a problem if the len of mlock is ULONG_MAX. The return value of mlock is zero. But nothing will be locked since the len in do_mlock overflows to zero due to the following code in mlock:

len = PAGE_ALIGN(len + (offset_in_page(start)));

The same problem happens in munlock.

Fix it by return -EINVAL if len overflows.

Ma Wupeng (1): mm/mlock: return EINVAL for illegal user memory range in mlock

mm/mlock.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-)