linux-kernel - Re: [PATCH 1/3] fs/ntfs3: Fix insertion of attr in ni_ins_attr

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Date:   Thu, 9 Sep 2021 15:36:28 +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 1/3] fs/ntfs3: Fix insertion of attr in ni_ins_attr_ext

On Thu, Sep 09, 2021 at 01:57:59PM +0300, Konstantin Komarov wrote:
> Do not try to insert attribute if there is no room in record.
> 
> Signed-off-by: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
> ---
>  fs/ntfs3/frecord.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/fs/ntfs3/frecord.c b/fs/ntfs3/frecord.c
> index 938b12d56ca6..5dd7b7a7c5e0 100644
> --- a/fs/ntfs3/frecord.c
> +++ b/fs/ntfs3/frecord.c
> @@ -956,6 +956,10 @@ static int ni_ins_attr_ext(struct ntfs_inode *ni, struct ATTR_LIST_ENTRY *le,
>  			continue;
>  		}
>  
> +		/* Do not try to insert this attribute if there is no room in record. */

Multiline comment as this gets very long.

> +		if (le32_to_cpu(mi->mrec->used) + asize > sbi->record_size)
> +			continue;
> +
>  		/* Try to insert attribute into this subrecord. */
>  		attr = ni_ins_new_attr(ni, mi, le, type, name, name_len, asize,
>  				       name_off, svcn, ins_le);
> -- 
> 2.28.0