linux-ext4 - Re: [PATCH 1/1] Null Pointer when make_indexed

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Date:	Mon, 9 May 2011 19:18:37 +0800
From:	Yongqiang Yang <xiaoqiangnk@...il.com>
To:	Jan Kara <jack@...e.cz>
Cc:	Allison Henderson <achender@...ux.vnet.ibm.com>,
	Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 1/1] Null Pointer when make_indexed_dir returns -ENOSPC

On Mon, May 9, 2011 at 7:03 PM, Jan Kara <jack@...e.cz> wrote:
> On Sat 07-05-11 16:54:27, Allison Henderson wrote:
>> Fix for a null pointer bug found while running punch hole tests
>>
>> Signed-off-by: Allison Henderson <achender@...ibm.com>
>> ---
>> :100644 100644 3c7a06e... 3302a6c... M        fs/ext4/namei.c
>>  fs/ext4/namei.c |    3 ++-
>>  1 files changed, 2 insertions(+), 1 deletions(-)
>>
>> diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
>> index 3c7a06e..3302a6c 100644
>> --- a/fs/ext4/namei.c
>> +++ b/fs/ext4/namei.c
>> @@ -1422,7 +1422,8 @@ static int make_indexed_dir(handle_t *handle, struct dentry *dentry,
>>                */
>>               ext4_mark_inode_dirty(handle, dir);
>>               ext4_handle_dirty_metadata(handle, dir, frame->bh);
>> -             ext4_handle_dirty_metadata(handle, dir, bh);
>> +             if (bh)
>> +                     ext4_handle_dirty_metadata(handle, dir, bh);
>  I'm puzzled - bh here is bh2 from the beginning of the function and we
> check it for being NULL after we ext4_append() it. So how can this happen?
do_split() encounters a journal error and set bh to NULL before returning.

>
>                                                                        Honza
>>               dx_release(frames);
>>               return retval;
>>       }
>> --
>> 1.7.1
>>
> --
> Jan Kara <jack@...e.cz>
> SUSE Labs, CR
> --
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-- 
Best Wishes
Yongqiang Yang
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