Without the following patch, perf top as non-root and
paranoid cpu set causes a NULL pointer dereference in
free_event() because event->ctx is NULL.
free_event() may be called, on the error path, before
event->ctx is set.
Signed-off-by: Stephane Eranian <eran...@google.com>
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index f29b525..a7d5e7a 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -2150,7 +2150,8 @@ static void free_event(struct perf_event *event)
if (event->destroy)
event->destroy(event);
- put_ctx(event->ctx);
+ if (event->ctx)
+ put_ctx(event->ctx);
call_rcu(&event->rcu_head, free_event_rcu);
}
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