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

[ Upstream commit 494b332064c0ce2f7392fa92632bc50191c1b517 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/kernel/trace/trace_eprobe.c b/kernel/trace/trace_eprobe.c
index d2370cdb4c1d644b4f427c9f35dce178f5d4a353..2a75cf3aa7bf886401578d11b63bcab1e2f31507 100644 (file)
--- a/kernel/trace/trace_eprobe.c
+++ b/kernel/trace/trace_eprobe.c
@@ -1069,6 +1069,11 @@ 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: