linux-kernel - [PATCH AUTOSEL 6.1 1/6] pm: cpupower: bench: Prevent NULL dereference on malloc failure

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Message-Id: <20250331143634.1686409-1-sashal@kernel.org>
Date: Mon, 31 Mar 2025 10:36:27 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Zhongqiu Han <quic_zhonhan@...cinc.com>,
	Shuah Khan <skhan@...uxfoundation.org>,
	Sasha Levin <sashal@...nel.org>,
	trenn@...e.com,
	shuah@...nel.org,
	jwyatt@...hat.com,
	jkacur@...hat.com,
	peng.fan@....com,
	linux-pm@...r.kernel.org
Subject: [PATCH AUTOSEL 6.1 1/6] pm: cpupower: bench: Prevent NULL dereference on malloc failure

From: Zhongqiu Han <quic_zhonhan@...cinc.com>

[ Upstream commit 208baa3ec9043a664d9acfb8174b332e6b17fb69 ]

If malloc returns NULL due to low memory, 'config' pointer can be NULL.
Add a check to prevent NULL dereference.

Link: https://lore.kernel.org/r/20250219122715.3892223-1-quic_zhonhan@quicinc.com
Signed-off-by: Zhongqiu Han <quic_zhonhan@...cinc.com>
Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/power/cpupower/bench/parse.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/power/cpupower/bench/parse.c b/tools/power/cpupower/bench/parse.c
index e63dc11fa3a53..48e25be6e1635 100644
--- a/tools/power/cpupower/bench/parse.c
+++ b/tools/power/cpupower/bench/parse.c
@@ -120,6 +120,10 @@ FILE *prepare_output(const char *dirname)
 struct config *prepare_default_config()
 {
 	struct config *config = malloc(sizeof(struct config));
+	if (!config) {
+		perror("malloc");
+		return NULL;
+	}
 
 	dprintf("loading defaults\n");
 
-- 
2.39.5