linux-kernel - [PATCH v3] tracing/probes: Fix memory leak in traceprobe_parse_probe_arg

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Date: Sat, 27 Apr 2024 08:23:47 +0100
From: lumingyindetect@....com
To: linux-trace-kernel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: rostedt@...dmis.org,
	mhiramat@...nel.org,
	mathieu.desnoyers@...icios.com,
	LuMingYin <lumingyindetect@....com>
Subject: [PATCH v3] tracing/probes: Fix memory leak in traceprobe_parse_probe_arg_body()

From: LuMingYin <lumingyindetect@....com>

If traceprobe_parse_probe_arg_body() failed to allocate 'parg->fmt',
it jumps to the label 'out' instead of 'fail' by mistake.In the result,
the buffer 'tmp' is not freed in this case and leaks its memory.

Thus jump to the label 'fail' in that error case.

Fixes: 032330abd08b ("tracing/probes: Cleanup probe argument parser")
Signed-off-by: LuMingYin <lumingyindetect@....com>
---
 kernel/trace/trace_probe.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index c09fa6fc636e..81c319b92038 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -1466,7 +1466,7 @@ static int traceprobe_parse_probe_arg_body(const char *argv, ssize_t *size,
 		parg->fmt = kmalloc(len, GFP_KERNEL);
 		if (!parg->fmt) {
 			ret = -ENOMEM;
-			goto out;
+			goto fail;
 		}
 		snprintf(parg->fmt, len, "%s[%d]", parg->type->fmttype,
 			 parg->count);
-- 
2.25.1