linux-kernel - [PATCH 1/6] tracing/eprobe: Fix to release eprobe when failed to add dyn

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Message-ID: <173262938070.8323.5243664675318084969.stgit@devnote2>
Date: Tue, 26 Nov 2024 22:56:20 +0900
From: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>,
	Naveen N Rao <naveen@...nel.org>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	"David S . Miller" <davem@...emloft.net>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Tzvetomir Stoyanov <tz.stoyanov@...il.com>,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org
Subject: [PATCH 1/6] tracing/eprobe: Fix to release eprobe when failed to add dyn_event

From: Masami Hiramatsu (Google) <mhiramat@...nel.org>

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

Fixes: 7491e2c44278 ("tracing: Add a probe that attaches to trace events")
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
---
 kernel/trace/trace_eprobe.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/trace/trace_eprobe.c b/kernel/trace/trace_eprobe.c
index ebda68ee9abf..be8be0c1aaf0 100644
--- 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: