linux-kernel - [PATCH 1/8] tracing: tprobe-events: Fix a memory leak when tprobe with $retval

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Message-ID:  <174055072650.4079315.3063014346697447838.stgit@mhiramat.tok.corp.google.com>
Date: Wed, 26 Feb 2025 15:18:46 +0900
From: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>,
	Shuah Khan <shuah@...nel.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Hari Bathini <hbathini@...ux.ibm.com>,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org
Subject: [PATCH 1/8] tracing: tprobe-events: Fix a memory leak when tprobe with $retval

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

Fix a memory leak when a tprobe is defined with $retval. This
combination is not allowed, but the parse_symbol_and_return() does
not free the *symbol which should not be used if it returns the error.
Thus, it leaks the *symbol memory in that error path.

Fixes: ce51e6153f77 ("tracing: fprobe-event: Fix to check tracepoint event and return")
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
Cc: stable@...r.kernel.org
---
 kernel/trace/trace_fprobe.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/trace/trace_fprobe.c b/kernel/trace/trace_fprobe.c
index b8f3c4ba309b..8826f44f69a4 100644
--- a/kernel/trace/trace_fprobe.c
+++ b/kernel/trace/trace_fprobe.c
@@ -1056,6 +1056,8 @@ static int parse_symbol_and_return(int argc, const char *argv[],
 			if (is_tracepoint) {
 				trace_probe_log_set_index(i);
 				trace_probe_log_err(tmp - argv[i], RETVAL_ON_PROBE);
+				kfree(*symbol);
+				*symbol = NULL;
 				return -EINVAL;
 			}
 			*is_return = true;