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

Pull perf fix from Ingo Molnar:
 "This fix adds missing RCU read protection"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  events: Protect access via task_subsys_state_check()

parents d7d7271f c79aa0d9

kernel/events/core.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -4596,6 +4596,7 @@ void perf_event_comm(struct task_struct *task)
		struct perf_event_context *ctx;
		int ctxn;

		rcu_read_lock();
		for_each_task_context_nr(ctxn) {
		ctx = task->perf_event_ctxp[ctxn];
		if (!ctx)
		@@ -4603,6 +4604,7 @@ void perf_event_comm(struct task_struct *task)

		perf_event_enable_on_exec(ctx);
		}
		rcu_read_unlock();

		if (!atomic_read(&nr_comm_events))
		return;