linux-kernel - [PATCH] thermal/drivers/cpuidle

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Date:   Fri, 19 Mar 2021 21:25:22 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     daniel.lezcano@...aro.org
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        Amit Daniel Kachhap <amit.kachhap@...il.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Javi Merino <javi.merino@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Amit Kucheria <amitk@...nel.org>,
        linux-pm@...r.kernel.org (open list:THERMAL/CPU_COOLING),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] thermal/drivers/cpuidle_cooling: Fix use after error

When the function successfully finishes it logs an information about
the registration of the cooling device and use its name to build the
message. Unfortunately it was freed right before:

drivers/thermal/cpuidle_cooling.c:218 __cpuidle_cooling_register()
	warn: 'name' was already freed.

Fix this by freeing after the message happened.

Fixes: 6fd1b186d900 ("thermal/drivers/cpuidle_cooling: Use device name instead of auto-numbering")
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 drivers/thermal/cpuidle_cooling.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/thermal/cpuidle_cooling.c b/drivers/thermal/cpuidle_cooling.c
index f32976163bad..4f41102e8b16 100644
--- a/drivers/thermal/cpuidle_cooling.c
+++ b/drivers/thermal/cpuidle_cooling.c
@@ -208,18 +208,20 @@ static int __cpuidle_cooling_register(struct device_node *np,
 
 	cdev = thermal_of_cooling_device_register(np, name, idle_cdev,
 						  &cpuidle_cooling_ops);
-	kfree(name);
-
 	if (IS_ERR(cdev)) {
 		ret = PTR_ERR(cdev);
-		goto out_unregister;
+		goto out_kfree_name;
 	}
 
 	pr_debug("%s: Idle injection set with idle duration=%u, latency=%u\n",
 		 name, idle_duration_us, latency_us);
 
+	kfree(name);
+
 	return 0;
 
+out_kfree_name:
+	kfree(name);
 out_unregister:
 	idle_inject_unregister(ii_dev);
 out_kfree:
-- 
2.25.1