tracing/eprobe: Fix to release eprobe when failed to add dyn_event

Fix eprobe event to unregister event call and release eprobe when it fails
to add dynamic event correctly.

Link: https://lore.kernel.org/all/173289886698.73724.1959899350183686006.stgit@devnote2/
Fixes: 7491e2c44278 ("tracing: Add a probe that attaches to trace events")
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>

diff --git a/kernel/trace/trace_eprobe.c b/kernel/trace/trace_eprobe.c
index ebda68ee9abff9013580b2fcee0b55a405b60b57..be8be0c1aaf0f17d80ba228c06e1ac560b38b90c 100644 (file)
--- a/kernel/trace/trace_eprobe.c
+++ b/kernel/trace/trace_eprobe.c
@@ -963,6 +963,11 @@ static int __trace_eprobe_create(int argc, const char *argv[])
                goto error;
        }
        ret = dyn_event_add(&ep->devent, &ep->tp.event->call);
+       if (ret < 0) {
+               trace_probe_unregister_event_call(&ep->tp);
+               mutex_unlock(&event_mutex);
+               goto error;
+       }
        mutex_unlock(&event_mutex);
        return ret;
 parse_error: