linux-kernel - [PATCH] tools:Fix a memory leak bug related to the cmd

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Message-Id: <20240323065550.603005-1-lumingyindetect@163.com>
Date: Sat, 23 Mar 2024 14:55:50 +0800
From: LuMingYin <lumingyindetect@....com>
To: linux-kernel@...r.kernel.org
Cc: peterz@...radead.org,
	LuMingYin <lumingyindetect@....com>
Subject: [PATCH] tools:Fix a memory leak bug related to the cmd

In the function 'disas_funcs' defined in the file /linux/tools/objtool/check.c, a pointer variable named 'cmd' is declared (line 4583 of the file). This pointer variable allocates a block of dynamic memory using the 'malloc' function at line 4615. However, after using the memory area pointed to by 'cmd' (line 4619), it is not deallocated, resulting in a memory leak bug. This commit fixes the bug.

Signed-off-by: LuMingYin <lumingyindetect@....com>
---
 tools/objtool/check.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index eb7e12ebc1d0..486a2a6374f5 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -4617,6 +4617,7 @@ static int disas_funcs(const char *funcs)
 	/* real snprintf() */
 	snprintf(cmd, size, objdump_str, cross_compile, objname, funcs);
 	ret = system(cmd);
+	free(cmd);
 	if (ret) {
 		WARN("disassembly failed: %d", ret);
 		return -1;
-- 
2.25.1