linux-kernel - Re: [PATCH v2] soc: bcm: brcmstb: Don't leak device tree node reference

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Date:   Tue, 27 Nov 2018 16:25:31 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Frank Lee <tiny.windzz@...il.com>,
        Brian Norris <computersforpeace@...il.com>,
        Gregory Fong <gregory.0xf0@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        bcm-kernel-feedback-list@...adcom.com, treding@...dia.com,
        olof@...om.net, Arnd Bergmann <arnd@...db.de>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] soc: bcm: brcmstb: Don't leak device tree node
 reference



On 11/26/18 6:42 AM, Frank Lee wrote:
> On Sat, Nov 24, 2018 at 10:52 PM Yangtao Li <tiny.windzz@...il.com> wrote:
>>
>> of_find_node_by_path() acquires a reference to the node returned by it
>> and that reference needs to be dropped by its caller. soc_is_brcmstb()
>> doesn't do that, so fix it.
>>
>> [treding: slightly rewrite to avoid inline comparison]
>>
>> Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
>> ---
>> Changes in v2:
>> -update changelog
>> -slightly rewrite to avoid inline comparison
>> ---
>>  drivers/soc/bcm/brcmstb/common.c | 6 +++++-
>>  1 file changed, 5 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/soc/bcm/brcmstb/common.c b/drivers/soc/bcm/brcmstb/common.c
>> index 14185451901d..bf9123f727e8 100644
>> --- a/drivers/soc/bcm/brcmstb/common.c
>> +++ b/drivers/soc/bcm/brcmstb/common.c
>> @@ -31,13 +31,17 @@ static const struct of_device_id brcmstb_machine_match[] = {
>>
>>  bool soc_is_brcmstb(void)
>>  {
>> +       const struct of_device_id *match;
>>         struct device_node *root;
>>
>>         root = of_find_node_by_path("/");
>>         if (!root)
>>                 return false;
>>
>> -       return of_match_node(brcmstb_machine_match, root) != NULL;
>> +       match = of_match_node(brcmstb_machine_match, root);
>> +       of_node_put(root);
>> +
>> +       return match != NULL;
>>  }
>>
>>  u32 brcmstb_get_family_id(void)
>> --
>> 2.17.0
>>
> Hi Florian:
> 
> How about this ?

This looks better, I will add:

Fixes: d52fad262041 ("soc: add stubs for brcmstb SoC's")

while applying the patch.
-- 
Florian