[PATCH 5/7] cpufreq/pasemi: fix possible object reference leak

[PATCH 5/7] cpufreq/pasemi: fix possible object reference leak

[Wen Yang]

The call to of_get_cpu_node returns a node pointer with refcount
incremented thus it must be explicitly decremented after the last
usage.

Detected by coccinelle with the following warnings:
./drivers/cpufreq/pasemi-cpufreq.c:212:1-7: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 147, but without a corresponding object release within this function.
./drivers/cpufreq/pasemi-cpufreq.c:220:1-7: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 147, but without a corresponding object release within this function.

Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-pm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
---
 drivers/cpufreq/pasemi-cpufreq.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/cpufreq/pasemi-cpufreq.c b/drivers/cpufreq/pasemi-cpufreq.c
index 75dfbd2..c7710c1 100644
--- a/drivers/cpufreq/pasemi-cpufreq.c
+++ b/drivers/cpufreq/pasemi-cpufreq.c
@@ -146,6 +146,7 @@ static int pas_cpufreq_cpu_init(struct cpufreq_policy *policy)
 
 	cpu = of_get_cpu_node(policy->cpu, NULL);
 
+	of_node_put(cpu);
 	if (!cpu)
 		goto out;
 
-- 
2.9.5

Re: [5/7] cpufreq/pasemi: Checking implementation of pas_cpufreq_cpu_init()

[Markus Elfring]

> @@ -146,6 +146,7 @@  static int pas_cpufreq_cpu_init(struct cpufreq_policy *policy)
>
>  	cpu = of_get_cpu_node(policy->cpu, NULL);
>
> +	of_node_put(cpu);
>  	if (!cpu)
>  		goto out;

Can the statement “return -ENODEV” be nicer as exception handling
in the if branch of this source code place?
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/drivers/cpufreq/pasemi-cpufreq.c?id=bf97b82f37c6d90e16de001d0659644c57fa490d#n137

Regards,
Markus

Re: [5/7] cpufreq/pasemi: Checking implementation of pas_cpufreq_cpu_init()

[Dan Carpenter]

On Wed, Apr 03, 2019 at 04:23:54PM +0200, Markus Elfring wrote:
> > @@ -146,6 +146,7 @@  static int pas_cpufreq_cpu_init(struct cpufreq_policy *policy)
> >
> >  	cpu = of_get_cpu_node(policy->cpu, NULL);
> >
> > +	of_node_put(cpu);
> >  	if (!cpu)
> >  		goto out;
> 
> Can the statement “return -ENODEV” be nicer as exception handling
> in the if branch of this source code place?
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/drivers/cpufreq/pasemi-cpufreq.c?id=bf97b82f37c6d90e16de001d0659644c57fa490d#n137
> 

Why am I only receiving only one side of this conversation?

I don't know why you're responding to...  It's not required to fix/change
unrelated style choices.  If people want, they can just focus on their
own thing.

regards,
dan carpenter

[PATCH 6/7] cpufreq: pmac32: fix possible object reference leak

[Wen Yang]

The call to of_find_node_by_name returns a node pointer with refcount
incremented thus it must be explicitly decremented after the last
usage.

Detected by coccinelle with the following warnings:
./drivers/cpufreq/pmac32-cpufreq.c:557:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 552, but without a corresponding object release within this function.
./drivers/cpufreq/pmac32-cpufreq.c:569:1-7: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 552, but without a corresponding object release within this function.
./drivers/cpufreq/pmac32-cpufreq.c:598:1-7: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 587, but without a corresponding object release within this function.

Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: linux-pm@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-kernel@vger.kernel.org
---
 drivers/cpufreq/pmac32-cpufreq.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/cpufreq/pmac32-cpufreq.c b/drivers/cpufreq/pmac32-cpufreq.c
index 52f0d91..9b4ce2e 100644
--- a/drivers/cpufreq/pmac32-cpufreq.c
+++ b/drivers/cpufreq/pmac32-cpufreq.c
@@ -552,6 +552,7 @@ static int pmac_cpufreq_init_7447A(struct device_node *cpunode)
 	volt_gpio_np = of_find_node_by_name(NULL, "cpu-vcore-select");
 	if (volt_gpio_np)
 		voltage_gpio = read_gpio(volt_gpio_np);
+	of_node_put(volt_gpio_np);
 	if (!voltage_gpio){
 		pr_err("missing cpu-vcore-select gpio\n");
 		return 1;
@@ -588,6 +589,7 @@ static int pmac_cpufreq_init_750FX(struct device_node *cpunode)
 	if (volt_gpio_np)
 		voltage_gpio = read_gpio(volt_gpio_np);
 
+	of_node_put(volt_gpio_np);
 	pvr = mfspr(SPRN_PVR);
 	has_cpu_l2lve = !((pvr & 0xf00) == 0x100);
 
-- 
2.9.5