linux-kernel - Re: [PATCH 1/1] f2fs: correctly check empty xattr key

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Date:	Fri, 20 Mar 2015 13:52:01 -0700
From:	Jaegeuk Kim <jaegeuk@...nel.org>
To:	Taesoo Kim <tsgatesv@...il.com>
Cc:	cm224.lee@...sung.com, linux-f2fs-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, taesoo@...ech.edu,
	changwoo@...ech.edu, sanidhya@...ech.edu, blee@...ech.edu,
	csong84@...ech.edu
Subject: Re: [PATCH 1/1] f2fs: correctly check empty xattr key

Hi Taesoo,

On Fri, Mar 20, 2015 at 12:19:07AM -0400, Taesoo Kim wrote:
> When xattr name (key) is empty (""), correctly return -EINVAL
> error. xattr_advise_set/get() seem to make the same mistake.

The intention here is to disallow any xattr name, since this is used to get or
set the i_advise value by users.

Thanks,

> 
> Signed-off-by: Taesoo Kim <tsgatesv@...il.com>
> ---
>  fs/f2fs/xattr.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/f2fs/xattr.c b/fs/f2fs/xattr.c
> index 5072bf9..6b1fbc4 100644
> --- a/fs/f2fs/xattr.c
> +++ b/fs/f2fs/xattr.c
> @@ -132,7 +132,7 @@ static int f2fs_xattr_advise_get(struct dentry *dentry, const char *name,
>  {
>  	struct inode *inode = dentry->d_inode;
>  
> -	if (strcmp(name, "") != 0)
> +	if (strcmp(name, "") == 0)
>  		return -EINVAL;
>  
>  	*((char *)buffer) = F2FS_I(inode)->i_advise;
> @@ -144,7 +144,7 @@ static int f2fs_xattr_advise_set(struct dentry *dentry, const char *name,
>  {
>  	struct inode *inode = dentry->d_inode;
>  
> -	if (strcmp(name, "") != 0)
> +	if (strcmp(name, "") == 0)
>  		return -EINVAL;
>  	if (!inode_owner_or_capable(inode))
>  		return -EPERM;
> -- 
> 2.3.3
--
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