Merge tag 'perf_urgent_for_v7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull perf fixes from Borislav Petkov:

 - Prevent the use of exited events as group leaders

 - Avoid use-after-free of an event's group leader by promoting detached
   sibling events to standalone entities and correct related accounting
   and state transitions

* tag 'perf_urgent_for_v7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/core: Fix group leader use-after-free after sibling detach
  perf: Reject exited events as group leaders