linux-kernel - [PATCH] pm: cpupower: bench: Prevent NULL dereference on malloc failure

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Message-ID: <20250219122715.3892223-1-quic_zhonhan@quicinc.com>
Date: Wed, 19 Feb 2025 20:27:15 +0800
From: Zhongqiu Han <quic_zhonhan@...cinc.com>
To: <trenn@...e.com>, <shuah@...nel.org>, <jwyatt@...hat.com>,
        <jkacur@...hat.com>, <peng.fan@....com>
CC: <linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <quic_zhonhan@...cinc.com>
Subject: [PATCH] pm: cpupower: bench: Prevent NULL dereference on malloc failure

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

Signed-off-by: Zhongqiu Han <quic_zhonhan@...cinc.com>
---
 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 080678d9d74e..bd67c758b33a 100644
--- a/tools/power/cpupower/bench/parse.c
+++ b/tools/power/cpupower/bench/parse.c
@@ -121,6 +121,10 @@ 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");
 
-- 
2.25.1