linux-kernel - [PATCH AUTOSEL 5.15 23/47] cpufreq: scmi: Avoid overflow of target

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Message-ID: <20240801003256.3937416-23-sashal@kernel.org>
Date: Wed, 31 Jul 2024 20:31:13 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Jagadeesh Kona <quic_jkona@...cinc.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Sasha Levin <sashal@...nel.org>,
	sudeep.holla@....com,
	rafael@...nel.org,
	arm-scmi@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-pm@...r.kernel.org
Subject: [PATCH AUTOSEL 5.15 23/47] cpufreq: scmi: Avoid overflow of target_freq in fast switch

From: Jagadeesh Kona <quic_jkona@...cinc.com>

[ Upstream commit 074cffb5020ddcaa5fafcc55655e5da6ebe8c831 ]

Conversion of target_freq to HZ in scmi_cpufreq_fast_switch()
can lead to overflow if the multiplied result is greater than
UINT_MAX, since type of target_freq is unsigned int. Avoid this
overflow by assigning target_freq to unsigned long variable for
converting it to HZ.

Signed-off-by: Jagadeesh Kona <quic_jkona@...cinc.com>
Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/cpufreq/scmi-cpufreq.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/cpufreq/scmi-cpufreq.c b/drivers/cpufreq/scmi-cpufreq.c
index c24e6373d3417..eb3f1952f9864 100644
--- a/drivers/cpufreq/scmi-cpufreq.c
+++ b/drivers/cpufreq/scmi-cpufreq.c
@@ -61,9 +61,9 @@ static unsigned int scmi_cpufreq_fast_switch(struct cpufreq_policy *policy,
 					     unsigned int target_freq)
 {
 	struct scmi_data *priv = policy->driver_data;
+	unsigned long freq = target_freq;
 
-	if (!perf_ops->freq_set(ph, priv->domain_id,
-				target_freq * 1000, true))
+	if (!perf_ops->freq_set(ph, priv->domain_id, freq * 1000, true))
 		return target_freq;
 
 	return 0;
-- 
2.43.0