linux-kernel - [PATCH 5.4 040/183] cpufreq: brcmstb-avs-cpufreq: add check for cpufreq_cpu

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Date: Sun, 24 Mar 2024 19:44:13 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Anastasia Belova <abelova@...ralinux.ru>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 040/183] cpufreq: brcmstb-avs-cpufreq: add check for cpufreq_cpu_get's return value

From: Anastasia Belova <abelova@...ralinux.ru>

[ Upstream commit f661017e6d326ee187db24194cabb013d81bc2a6 ]

cpufreq_cpu_get may return NULL. To avoid NULL-dereference check it
and return 0 in case of error.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: de322e085995 ("cpufreq: brcmstb-avs-cpufreq: AVS CPUfreq driver for Broadcom STB SoCs")
Signed-off-by: Anastasia Belova <abelova@...ralinux.ru>
Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/cpufreq/brcmstb-avs-cpufreq.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/cpufreq/brcmstb-avs-cpufreq.c b/drivers/cpufreq/brcmstb-avs-cpufreq.c
index 541486217984b..1302e1900dcb1 100644
--- a/drivers/cpufreq/brcmstb-avs-cpufreq.c
+++ b/drivers/cpufreq/brcmstb-avs-cpufreq.c
@@ -457,6 +457,8 @@ static bool brcm_avs_is_firmware_loaded(struct private_data *priv)
 static unsigned int brcm_avs_cpufreq_get(unsigned int cpu)
 {
 	struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
+	if (!policy)
+		return 0;
 	struct private_data *priv = policy->driver_data;
 
 	return brcm_avs_get_frequency(priv->base);
-- 
2.43.0