linux-kernel - [PATCH] cpufreq: scmi: fix use-after-free in scmi_cpufreq

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Date:   Sat, 16 Feb 2019 11:31:48 -0500
From:   Yangtao Li <tiny.windzz@...il.com>
To:     sudeep.holla@....com, rjw@...ysocki.net, viresh.kumar@...aro.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Yangtao Li <tiny.windzz@...il.com>
Subject: [PATCH] cpufreq: scmi: fix use-after-free in scmi_cpufreq_exit()

This issue was detected with the help of Coccinelle. So
change the order of function calls to fix it.

Fixes: 1690d8bb91e37 (cpufreq: scpi/scmi: Fix freeing of dynamic OPPs)

Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
---
 drivers/cpufreq/scmi-cpufreq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/cpufreq/scmi-cpufreq.c b/drivers/cpufreq/scmi-cpufreq.c
index 242c3370544e..9ed46d188cb5 100644
--- a/drivers/cpufreq/scmi-cpufreq.c
+++ b/drivers/cpufreq/scmi-cpufreq.c
@@ -187,8 +187,8 @@ static int scmi_cpufreq_exit(struct cpufreq_policy *policy)
 
 	cpufreq_cooling_unregister(priv->cdev);
 	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;
 }
-- 
2.17.0