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From: lumingyindetect@126.com
To: linux-trace-kernel@vger.kernel.org,
	linux-kernel@vger.kernel.org
Cc: rostedt@goodmis.org,
	mhiramat@kernel.org,
	mathieu.desnoyers@efficios.com,
	LuMingYin <11570291+yin-luming@user.noreply.gitee.com>
Subject: [PATCH] kernel/trace/trace_probe:Fixed memory leak issues in trace_probe.c.
Date: Fri, 26 Apr 2024 10:13:43 +0100
Message-Id: <20240426091343.1222770-1-lumingyindetect@126.com>
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From: LuMingYin <11570291+yin-luming@user.noreply.gitee.com>

At line 1408 of the file /linux/kernel/trace/trace_probe.c, pointer variables named code and tmp are defined. At line 1437, a new dynamic memory area is allocated using the function kcalloc. When the if statement at line 1467 evaluates to true, the program jumps to the out label at line 1469. Within this function, there are two labels: out and fail. The difference between these two labels is that fail additionally frees the dynamic memory area pointed to by the variable code. Therefore, the program should jump to the fail label instead of the out label. This commit fixes this bug.

Signed-off-by: LuMingYin <11570291+yin-luming@user.noreply.gitee.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 dfe3ee6035ec..42bc0f362226 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