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SubjectRe:Re: [PATCH] powerpc: powernv: Fix refcount leak bug in opal-powercap



At 2022-06-17 13:01:27, "Christophe JAILLET" <christophe.jaillet@wanadoo.fr> wrote:
>Le 17/06/2022 à 06:20, Liang He a écrit :
>> In opal_powercap_init(), of_find_compatible_node() will return
>> a node pointer with refcount incremented. We should use of_node_put()
>> in fail path or when it is not used anymore.
>>
>> Besides, for_each_child_of_node() will automatically *inc* and *dec*
>> refcount during iteration. However, we should add the of_node_put()
>> if there is a break.
>
>Hi,
>
>I'm not sure that your patch is right here. Because of this *inc* and
>*dec* things, do we still need to of_node_put(powercap) once we have
>entered for_each_child_of_node?
>
>I think that this reference will be released on the first iteration of
>the loop.
>

Hi, CJ,

Thanks for your reply and I want have a discuss.

Based on my review on the src of 'of_get_next_child', there is only
*inc* for next and *dec* for pre as follow.

(|node| == powercap)
======__of_get_next_child( |node|, prev)======
...
next = prev? prev->sibling:|node|->child;
of_node_get(next);
of_node_put(prev);
...
=========================

However, there is no any code to release the |node| (i.e., *powercap*).

Am I right? If I am wrong, please correct me, thanks.

>
>Maybe of_node_put(powercap) should be duplicated everywhere it is
>relevant and removed from the error handling path?
>Or an additional reference should be taken before the loop?
>Or adding a new label with "powercap = NULL" and branching there when
>needed?
>
>CJ

If my understanding is right, I think current patch is right.

Otherwise, I will make a new patch to handle that, Thanks.

Liang

>
>>
>> Signed-off-by: Liang He <windhl@126.com>
>> ---
>> arch/powerpc/platforms/powernv/opal-powercap.c | 5 ++++-
>> 1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/powerpc/platforms/powernv/opal-powercap.c b/arch/powerpc/platforms/powernv/opal-powercap.c
>> index 64506b46e77b..b102477d3f95 100644
>> --- a/arch/powerpc/platforms/powernv/opal-powercap.c
>> +++ b/arch/powerpc/platforms/powernv/opal-powercap.c
>> @@ -153,7 +153,7 @@ void __init opal_powercap_init(void)
>> pcaps = kcalloc(of_get_child_count(powercap), sizeof(*pcaps),
>> GFP_KERNEL);
>> if (!pcaps)
>> - return;
>> + goto out_powercap;
>>
>> powercap_kobj = kobject_create_and_add("powercap", opal_kobj);
>> if (!powercap_kobj) {
>> @@ -236,6 +236,9 @@ void __init opal_powercap_init(void)
>> kfree(pcaps[i].pg.name);
>> }
>> kobject_put(powercap_kobj);
>> + of_node_put(node);
>> out_pcaps:
>> kfree(pcaps);
>> +out_powercap:
>> + of_node_put(powercap);
>> }
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