oprofile: Free potentially owned tasks in case of errors

commit 6ac6519b upstream.

After registering the task free notifier we possibly have tasks in our
dying_tasks list. Free them after unregistering the notifier in case
of an error.
Signed-off-by: Robert Richter <robert.richter@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/oprofile/buffer_sync.c

@@ -140,6 +140,13 @@ static struct notifier_block module_load_nb = {
 	.notifier_call = module_load_notify,
 };
 
+static void free_all_tasks(void)
+{
+	/* make sure we don't leak task structs */
+	process_task_mortuary();
+	process_task_mortuary();
+}
+
 int sync_start(void)
 {
 	int err;
@@ -173,6 +180,7 @@ int sync_start(void)
 	profile_event_unregister(PROFILE_TASK_EXIT, &task_exit_nb);
 out2:
 	task_handoff_unregister(&task_free_nb);
+	free_all_tasks();
 out1:
 	free_cpumask_var(marked_cpus);
 	goto out;
@@ -191,10 +199,7 @@ void sync_stop(void)
 	mutex_unlock(&buffer_mutex);
 	flush_scheduled_work();
 
-	/* make sure we don't leak task structs */
-	process_task_mortuary();
-	process_task_mortuary();
-
+	free_all_tasks();
 	free_cpumask_var(marked_cpus);
 }