Commit 5670a847 authored Oct 22, 2017 by Linus Torvalds

Merge branch 'smp-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull smp/hotplug fix from Thomas Gleixner:
 "The recent rework of the callback invocation missed to cleanup the
  leftovers of the operation, so under certain circumstances a
  subsequent CPU hotplug operation accesses stale data and crashes.
  Clean it up."

* 'smp-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  cpu/hotplug: Reset node state after operation

parents 085cf9bf 1f7c70d6

kernel/cpu.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -632,6 +632,11 @@ cpuhp_invoke_ap_callback(int cpu, enum cpuhp_state state, bool bringup,
		__cpuhp_kick_ap(st);
		}

		/*
		* Clean up the leftovers so the next hotplug operation wont use stale
		* data.
		*/
		st->node = st->last = NULL;
		return ret;
		}