linux-kernel - Re: [PATCH] drivers/base/node: Fix double free in register_one

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Message-ID: <7c38e725-f6d5-4691-b211-a22fc67db85c@redhat.com>
Date: Thu, 18 Sep 2025 07:56:06 +0200
From: David Hildenbrand <david@...hat.com>
To: Donet Tom <donettom@...ux.ibm.com>, akpm@...ux-foundation.org,
 clm@...a.com
Cc: Jonathan.Cameron@...wei.com, alison.schofield@...el.com, dakr@...nel.org,
 dave.jiang@...el.com, gregkh@...uxfoundation.org,
 kamezawa.hiroyu@...fujitsu.com, linux-kernel@...r.kernel.org,
 linux-mm@...ck.org, osalvador@...e.de, rafael@...nel.org,
 ritesh.list@...il.com, yury.norov@...il.com, ziy@...dia.com
Subject: Re: [PATCH] drivers/base/node: Fix double free in register_one_node()

On 18.09.25 07:55, David Hildenbrand wrote:
> On 18.09.25 07:41, Donet Tom wrote:
>> When device_register() fails in register_node(), it calls
>> put_device(&node->dev). This triggers node_device_release(),
>> which calls kfree(to_node(dev)), thereby freeing the entire
>> node structure.
>>
>> As a result, when register_node() returns an error, the node
>> memory has already been freed. Calling kfree(node) again in
>> register_one_node() leads to a double free.
>>
>> This patch removes the redundant kfree(node) from
>> register_one_node() to prevent the double free.
>>
>> Fixes: 786eb990cfb7 ("drivers/base/node: handle error properly in register_one_node()")
>> Signed-off-by: Donet Tom <donettom@...ux.ibm.com>
>> ---
>>    drivers/base/node.c | 1 -
>>    1 file changed, 1 deletion(-)
>>
>> diff --git a/drivers/base/node.c b/drivers/base/node.c
>> index 1608816de67f..6b6e55a98b79 100644
>> --- a/drivers/base/node.c
>> +++ b/drivers/base/node.c
>> @@ -885,7 +885,6 @@ int register_one_node(int nid)
>>    	error = register_node(node_devices[nid], nid);
>>    	if (error) {
>>    		node_devices[nid] = NULL;
>> -		kfree(node);
>>    		return error;
>>    	}
>>    
> 
> Yes, that matches what other users (staring at mm/memory-tiers.c) do.

I forgot

Acked-by: David Hildenbrand <david@...hat.com>

-- 
Cheers

David / dhildenb