[PATCH] of: fix "/cpus" reference leak in of_numa_parse_cpu_nodes()

[PATCH] of: fix "/cpus" reference leak in of_numa_parse_cpu_nodes()

[Tyrel Datwyler]

The call to of_find_node_by_path("/cpus") returns the cpus device_node
with its reference count incremented. There is no matching of_node_put()
call in of_numa_parse_cpu_nodes() which results in a leaked reference
to the "/cpus" node.

This patch adds an of_node_put() to release the reference.

fixes: 298535c00a2c ("of, numa: Add NUMA of binding implementation.")
Signed-off-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com>
---
 drivers/of/of_numa.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/of/of_numa.c b/drivers/of/of_numa.c
index a53982a..2db1f7a 100644
--- a/drivers/of/of_numa.c
+++ b/drivers/of/of_numa.c
@@ -57,6 +57,8 @@ static void __init of_numa_parse_cpu_nodes(void)
 		else
 			node_set(nid, numa_nodes_parsed);
 	}
+
+	of_node_put(cpus);
 }
 
 static int __init of_numa_parse_memory_nodes(void)
-- 
1.8.3.1

Re: [PATCH] of: fix "/cpus" reference leak in of_numa_parse_cpu_nodes()

[David Daney]

On 04/17/2017 05:29 PM, Tyrel Datwyler wrote:
> The call to of_find_node_by_path("/cpus") returns the cpus device_node
> with its reference count incremented. There is no matching of_node_put()
> call in of_numa_parse_cpu_nodes() which results in a leaked reference
> to the "/cpus" node.
> 
> This patch adds an of_node_put() to release the reference.

Good catch:
Acked-by: David Daney <david.daney@cavium.com>

> 
> fixes: 298535c00a2c ("of, numa: Add NUMA of binding implementation.")
> Signed-off-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com>
> ---
>   drivers/of/of_numa.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/of/of_numa.c b/drivers/of/of_numa.c
> index a53982a..2db1f7a 100644
> --- a/drivers/of/of_numa.c
> +++ b/drivers/of/of_numa.c
> @@ -57,6 +57,8 @@ static void __init of_numa_parse_cpu_nodes(void)
>   		else
>   			node_set(nid, numa_nodes_parsed);
>   	}
> +
> +	of_node_put(cpus);
>   }
>   
>   static int __init of_numa_parse_memory_nodes(void)
> 

Re: [PATCH] of: fix "/cpus" reference leak in of_numa_parse_cpu_nodes()

[Rob Herring]

On Tue, Apr 18, 2017 at 10:16 AM, David Daney <ddaney@caviumnetworks.com> wrote:
> On 04/17/2017 05:29 PM, Tyrel Datwyler wrote:
>>
>> The call to of_find_node_by_path("/cpus") returns the cpus device_node
>> with its reference count incremented. There is no matching of_node_put()
>> call in of_numa_parse_cpu_nodes() which results in a leaked reference
>> to the "/cpus" node.
>>
>> This patch adds an of_node_put() to release the reference.
>
>
> Good catch:
> Acked-by: David Daney <david.daney@cavium.com>

Applied, thanks.

Rob