linux-kernel - Re: [PATCH 4/6] xfs: use memdup

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Date:	Wed, 8 Apr 2009 15:06:40 -0500
From:	Felix Blyakher <felixb@....com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Li Zefan <lizf@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, xfs@....sgi.com
Subject: Re: [PATCH 4/6] xfs: use memdup_user()


On Apr 8, 2009, at 8:22 AM, Christoph Hellwig wrote:

> On Wed, Apr 08, 2009 at 03:08:04PM +0800, Li Zefan wrote:
>> Remove open-coded memdup_user()
>>
>> Signed-off-by: Li Zefan <lizf@...fujitsu.com>
>> ---
>> fs/xfs/linux-2.6/xfs_ioctl.c   |   23 +++++++----------------
>> fs/xfs/linux-2.6/xfs_ioctl32.c |   12 ++++--------
>> 2 files changed, 11 insertions(+), 24 deletions(-)
>>
>> diff --git a/fs/xfs/linux-2.6/xfs_ioctl.c b/fs/xfs/linux-2.6/ 
>> xfs_ioctl.c
>> index d0b4994..34eaab6 100644
>> --- a/fs/xfs/linux-2.6/xfs_ioctl.c
>> +++ b/fs/xfs/linux-2.6/xfs_ioctl.c
>> @@ -489,17 +489,12 @@ xfs_attrmulti_attr_set(
>> 	if (len > XATTR_SIZE_MAX)
>> 		return EINVAL;
>>
>> -	kbuf = kmalloc(len, GFP_KERNEL);
>> -	if (!kbuf)
>> -		return ENOMEM;
>> -
>> -	if (copy_from_user(kbuf, ubuf, len))
>> -		goto out_kfree;
>> +	kbuf = memdup_user(ubuf, len);
>> +	if (IS_ERR(kbuf))
>> +		return PTR_ERR(kbuf);
>
> wouldn't NULL be a better error return for this kind of interface,
> matching kmalloc?
>
>
> Otherwise the patch looks good to me.
>
> Reviewed-by: Christoph Hellwig <hch@....de>

Looks good to me too.

Reviewed-by: Felix Blyakher <felixb@....com>

p.s. Replying to reply as I couldn't find the original post.

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