linux-kernel - [PATCH] cpufreq: scpi: fix use after free

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Message-Id: <20190327220642.8117-1-vincent.stehle@laposte.net>
Date:   Wed, 27 Mar 2019 23:06:42 +0100
From:   Vincent Stehlé <vincent.stehle@...oste.net>
To:     linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Vincent Stehlé <vincent.stehle@...oste.net>,
        Sudeep Holla <sudeep.holla@....com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>
Subject: [PATCH] cpufreq: scpi: fix use after free

Free the priv structure only after we are done using it.

Fixes: 1690d8bb91e370ab ("cpufreq: scpi/scmi: Fix freeing of dynamic OPPs")
Signed-off-by: Vincent Stehlé <vincent.stehle@...oste.net>
Cc: Sudeep Holla <sudeep.holla@....com>
Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: Viresh Kumar <viresh.kumar@...aro.org>
---
 drivers/cpufreq/scpi-cpufreq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/cpufreq/scpi-cpufreq.c b/drivers/cpufreq/scpi-cpufreq.c
index 3f49427766b88..2b51e0718c9f6 100644
--- a/drivers/cpufreq/scpi-cpufreq.c
+++ b/drivers/cpufreq/scpi-cpufreq.c
@@ -189,8 +189,8 @@ static int scpi_cpufreq_exit(struct cpufreq_policy *policy)
 
 	clk_put(priv->clk);
 	dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table);
-	kfree(priv);
 	dev_pm_opp_remove_all_dynamic(priv->cpu_dev);
+	kfree(priv);
 
 	return 0;
 }
-- 
2.20.1