linux-kernel - [PATCH] cpuidle: Avoid possible NULL pointer dereference in __cpuidle_register

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Date:	Mon, 02 Apr 2012 20:14:22 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	lenb@...nel.org
Cc:	khilman@...com, deepthi@...ux.vnet.ibm.com, g.trinabh@...il.com,
	arjan@...radead.org, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	daniel.lezcano@...aro.org, amit.kucheria@...aro.org
Subject: [PATCH] cpuidle: Avoid possible NULL pointer dereference in
 __cpuidle_register_device()

In __cpuidle_register_device(), "dev->cpu" is used before checking if dev is
non-NULL. Fix it.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
---

 drivers/cpuidle/cpuidle.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index 87411ce..75b381e 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -372,7 +372,7 @@ EXPORT_SYMBOL_GPL(cpuidle_disable_device);
 static int __cpuidle_register_device(struct cpuidle_device *dev)
 {
 	int ret;
-	struct device *cpu_dev = get_cpu_device((unsigned long)dev->cpu);
+	struct device *cpu_dev;
 	struct cpuidle_driver *cpuidle_driver = cpuidle_get_driver();
 
 	if (!dev)
@@ -380,6 +380,7 @@ static int __cpuidle_register_device(struct cpuidle_device *dev)
 	if (!try_module_get(cpuidle_driver->owner))
 		return -EINVAL;
 
+	cpu_dev = get_cpu_device((unsigned long)dev->cpu);
 	init_completion(&dev->kobj_unregister);
 
 	per_cpu(cpuidle_devices, dev->cpu) = dev;

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