linux-kernel - [PATCH] objtool: fix potential memory leak special_get

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Message-ID: <20200702110025.16883-1-chenwandun@huawei.com>
Date:   Thu, 2 Jul 2020 19:00:25 +0800
From:   Chen Wandun <chenwandun@...wei.com>
To:     <jpoimboe@...hat.com>, <peterz@...radead.org>,
        <linux-kernel@...r.kernel.org>
CC:     <chenwandun@...wei.com>
Subject: [PATCH] objtool: fix potential memory leak special_get_alts()

If get_alt_entry() return error, struct special_alt will leak.

Fixes: 442f04c34a1a ("objtool: Add tool to perform compile-time stack metadata validation")
Signed-off-by: Chen Wandun <chenwandun@...wei.com>
---
 tools/objtool/special.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/objtool/special.c b/tools/objtool/special.c
index e893f1e48e44..90a6ba2d5895 100644
--- a/tools/objtool/special.c
+++ b/tools/objtool/special.c
@@ -188,8 +188,10 @@ int special_get_alts(struct elf *elf, struct list_head *alts)
 			memset(alt, 0, sizeof(*alt));
 
 			ret = get_alt_entry(elf, entry, sec, idx, alt);
-			if (ret)
+			if (ret) {
+				free(alt);
 				return ret;
+			}
 
 			list_add_tail(&alt->list, alts);
 		}
-- 
2.17.1