oprofile: Free potentially owned tasks in case of errors

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.

Cc: <stable@kernel.org> # .36+
Signed-off-by: Robert Richter <robert.richter@amd.com>

1 files changed, 9 insertions, 4 deletions

diff --git a/drivers/oprofile/buffer_sync.c b/drivers/oprofile/buffer_sync.c
index a3984f4ef192..04250aa16f51 100644
--- a/drivers/oprofile/buffer_sync.c
+++ b/drivers/oprofile/buffer_sync.c
@@ -141,6 +141,13 @@ 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;
@@ -174,6 +181,7 @@ out3:
         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;
@@ -192,10 +200,7 @@ void sync_stop(void)
         mutex_unlock(&buffer_mutex);
         flush_cpu_work();
 
-        /* make sure we don't leak task structs */
-        process_task_mortuary();
-        process_task_mortuary();
-
+        free_all_tasks();
         free_cpumask_var(marked_cpus);
 }