linux-kernel - Re: [PATCH] Fix possible kobject reference counter leak in kobject

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Date:	Fri, 22 Aug 2008 11:31:17 +0900
From:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
To:	Greg KH <gregkh@...e.de>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Fix possible kobject reference counter leak in	kobject_rename()

Greg KH wrote:
> On Thu, Aug 21, 2008 at 07:31:48PM +0900, Kenji Kaneshige wrote:
>> Hi,
>>
>> I found a possible kobject reference counter leak problem in
>> kobject_rename(). The following patch will fix it.
>>
>> Thanks,
>> Kenji Kaneshige
>>
>>
>> Fix possible kobject reference counter leak in kobject_rename().
>>
>> If kobject_rename() failed because of name collision, we must call
>> kobject_put() for specified kobject before return.
>>
>> Signed-off-by: Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
>>
>> ---
>>  lib/kobject.c |    1 +
>>  1 file changed, 1 insertion(+)
>>
>> Index: linux-2.6.27-rc4/lib/kobject.c
>> ===================================================================
>> --- linux-2.6.27-rc4.orig/lib/kobject.c
>> +++ linux-2.6.27-rc4/lib/kobject.c
>> @@ -411,6 +411,7 @@ int kobject_rename(struct kobject *kobj,
>>  			       "to '%s' as '%s' is already in existence.\n",
>>  			       kobject_name(kobj), new_name, new_name);
>>  			kobject_put(temp_kobj);
>> +			kobject_put(kobj);
>>  			return -EINVAL;
>>  		}
>>  	}
> 
> Thanks, but this is already fixed up with a patch from Eric in my tree
> in a different way.
> 
> greg k-h
> 
> 

Ah, I see. I didn't notice that. Thank you for the information.

Thanks,
Kenji Kaneshige


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