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Date:   Tue, 31 Aug 2021 05:52:05 +0000
From:   Joel Becker <jlbec@evilplan.org>
To:     Christoph Hellwig <hch@lst.de>
Cc:     Sishuai Gong <sishuai@purdue.edu>,
        Al Viro <viro@zeniv.linux.org.uk>,
        linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH 1/4] configfs: return -ENAMETOOLONG earlier in
 configfs_lookup
Message-ID: <YS3DhWLIge5br/Kg@zeniv-ca.linux.org.uk>
Mail-Followup-To: Christoph Hellwig <hch@lst.de>,
        Sishuai Gong <sishuai@purdue.edu>,
        Al Viro <viro@zeniv.linux.org.uk>, linux-kernel@vger.kernel.org,
        linux-fsdevel@vger.kernel.org
References: <20210825064906.1694233-1-hch@lst.de>
 <20210825064906.1694233-2-hch@lst.de>
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Acked-by: Joel Becker <jlbec@evilplan.org>

On Wed, Aug 25, 2021 at 08:49:03AM +0200, Christoph Hellwig wrote:
> Just like most other file systems: get the simple checks out of the
> way first.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  fs/configfs/dir.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c
> index ac5e0c0e9181..cf08bbde55f3 100644
> --- a/fs/configfs/dir.c
> +++ b/fs/configfs/dir.c
> @@ -456,6 +456,9 @@ static struct dentry * configfs_lookup(struct inode *dir,
>  	int found = 0;
>  	int err;
>  
> +	if (dentry->d_name.len > NAME_MAX)
> +		return ERR_PTR(-ENAMETOOLONG);
> +
>  	/*
>  	 * Fake invisibility if dir belongs to a group/default groups hierarchy
>  	 * being attached
> @@ -486,8 +489,6 @@ static struct dentry * configfs_lookup(struct inode *dir,
>  		 * If it doesn't exist and it isn't a NOT_PINNED item,
>  		 * it must be negative.
>  		 */
> -		if (dentry->d_name.len > NAME_MAX)
> -			return ERR_PTR(-ENAMETOOLONG);
>  		d_add(dentry, NULL);
>  		return NULL;
>  	}
> -- 
> 2.30.2
> 

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