linux-kernel - Re: [f2fs-dev] [PATCH 3/4] f2fs: return proper error from start_gc

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Message-ID: <CAKYAXd_Yfu7OE9EOhCbfTHOz-KpD4dS+U_90LEnTuf34dCx29w@mail.gmail.com>
Date:	Fri, 24 May 2013 07:37:49 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	Jason Hrycay <jhrycay@...il.com>
Cc:	jaegeuk.kim@...sung.com, Amit Sahrawat <a.sahrawat@...sung.com>,
	Namjae Jeon <namjae.jeon@...sung.com>,
	linux-kernel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net,
	linux-fsdevel@...r.kernel.org, jason.hrycay@...orola.com
Subject: Re: [f2fs-dev] [PATCH 3/4] f2fs: return proper error from start_gc_thread

2013/5/23, Jason Hrycay <jhrycay@...il.com>:
> On 5/23/2013 8:58 AM, Namjae Jeon wrote:
>> From: Namjae Jeon <namjae.jeon@...sung.com>
>>
>> when there is an error from kthread_run, then return proper error
>> rather than returning -ENOMEM.
>>
>> Signed-off-by: Namjae Jeon <namjae.jeon@...sung.com>
>> Signed-off-by: Amit Sahrawat <a.sahrawat@...sung.com>
>> ---
>>  fs/f2fs/gc.c |    2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
>> index 25b083c..03d5ba1 100644
>> --- a/fs/f2fs/gc.c
>> +++ b/fs/f2fs/gc.c
>> @@ -105,7 +105,7 @@ int start_gc_thread(struct f2fs_sb_info *sbi)
>>  	if (IS_ERR(gc_th->f2fs_gc_task)) {
>>  		kfree(gc_th);
>
> gc_th is free'd here, save off PTR_ERR result to avoid use-after-free?
Yes, I will change this patch.
Thanks for review :)
>
>>  		sbi->gc_thread = NULL;
>> -		return -ENOMEM;
>> +		return PTR_ERR(gc_th->f2fs_gc_task);
>>  	}
>>  	return 0;
>>  }
>>
>
> --
> Jason Hrycay
>
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