linux-kernel - Re: [PATCH 3/4] fs/ntfs3: Check new size for limits

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Message-ID: <20211026212234.nfxb7fikbw2seksh@kari-VirtualBox>
Date:   Wed, 27 Oct 2021 00:22:34 +0300
From:   Kari Argillander <kari.argillander@...il.com>
To:     Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
Cc:     ntfs3@...ts.linux.dev, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 3/4] fs/ntfs3: Check new size for limits

On Mon, Oct 25, 2021 at 07:59:26PM +0300, Konstantin Komarov wrote:
> We must check size before trying to allocate.
> Size can be set for example by "ulimit -f".
> Fixes xfstest generic/228

generic/228		[21:20:39][   18.058334] run fstests generic/228 at 2021-10-26 21:20:39
 [21:20:41] 2s
Ran: generic/228
Passed all 1 tests

> Fixes: 4342306f0f0d ("fs/ntfs3: Add file operations and implementation")
> 
> Signed-off-by: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>

Reviewed-by: Kari Argillander <kari.argillander@...il.com>

> ---
>  fs/ntfs3/file.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/ntfs3/file.c b/fs/ntfs3/file.c
> index 5418e5ba64b3..efb3110e1790 100644
> --- a/fs/ntfs3/file.c
> +++ b/fs/ntfs3/file.c
> @@ -661,7 +661,13 @@ static long ntfs_fallocate(struct file *file, int mode, loff_t vbo, loff_t len)
>  		/*
>  		 * Normal file: Allocate clusters, do not change 'valid' size.
>  		 */
> -		err = ntfs_set_size(inode, max(end, i_size));
> +		loff_t new_size = max(end, i_size);
> +
> +		err = inode_newsize_ok(inode, new_size);
> +		if (err)
> +			goto out;
> +
> +		err = ntfs_set_size(inode, new_size);
>  		if (err)
>  			goto out;
>  
> -- 
> 2.33.0
> 
>