linux-kernel - [tip: objtool/core] objtool: Fix memory leak in create_static_call

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Date:   Sat, 07 Jan 2023 10:53:12 -0000
From:   "tip-bot2 for Miaoqian Lin" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Miaoqian Lin <linmq006@...il.com>, Ingo Molnar <mingo@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: objtool/core] objtool: Fix memory leak in create_static_call_sections()

The following commit has been merged into the objtool/core branch of tip:

Commit-ID:     3da73f102309fe29150e5c35acd20dd82063ff67
Gitweb:        https://git.kernel.org/tip/3da73f102309fe29150e5c35acd20dd82063ff67
Author:        Miaoqian Lin <linmq006@...il.com>
AuthorDate:    Mon, 05 Dec 2022 12:06:42 +04:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Sat, 07 Jan 2023 11:45:24 +01:00

objtool: Fix memory leak in create_static_call_sections()

strdup() allocates memory for key_name. We need to release the memory in
the following error paths. Add free() to avoid memory leak.

Fixes: 1e7e47883830 ("x86/static_call: Add inline static call implementation for x86-64")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Link: https://lore.kernel.org/r/20221205080642.558583-1-linmq006@gmail.com
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
---
 tools/objtool/check.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 4350be7..cab1a16 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -679,6 +679,7 @@ static int create_static_call_sections(struct objtool_file *file)
 		if (strncmp(key_name, STATIC_CALL_TRAMP_PREFIX_STR,
 			    STATIC_CALL_TRAMP_PREFIX_LEN)) {
 			WARN("static_call: trampoline name malformed: %s", key_name);
+			free(key_name);
 			return -1;
 		}
 		tmp = key_name + STATIC_CALL_TRAMP_PREFIX_LEN - STATIC_CALL_KEY_PREFIX_LEN;
@@ -688,6 +689,7 @@ static int create_static_call_sections(struct objtool_file *file)
 		if (!key_sym) {
 			if (!opts.module) {
 				WARN("static_call: can't find static_call_key symbol: %s", tmp);
+				free(key_name);
 				return -1;
 			}