Merge branch 'net-sched-use-after-free'

Cong Wang says:

====================
net_sched: fix a use-after-free for tc actions

This patchset fixes a use-after-free reported by Lucas
and closes potential races too.

Please see each patch for details.
====================

Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>