Re: [PATCH 3/5] ocfs2: validate inline xattr header before ibody remove

[Joseph Qi]

On 5/8/26 4:59 PM, ZhengYuan Huang wrote:
> [BUG]
> A corrupt inline xattr header can make ocfs2_xattr_ibody_remove() pass an
> unchecked header into ocfs2_remove_value_outside() during inode xattr
> teardown.
> 
> [CAUSE]
> ocfs2_xattr_ibody_remove() still rebuilt the ibody xattr header directly
> from di->i_xattr_inline_size and then handed it to code that iterates
> xh_count and entry geometry.
> 
> [FIX]
> Validate the inline xattr header with the shared helper before handing it
> to the outside-value removal path, and propagate -EFSCORRUPTED on bad
> metadata instead of traversing the unchecked header.
> 
> Signed-off-by: ZhengYuan Huang <gality369@xxxxxxxxx>

Looks fine.
Reviewed-by: Joseph Qi <joseph.qi@xxxxxxxxxxxxxxxxx>
> ---
>  fs/ocfs2/xattr.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c
> index 05f6f0a886cf..bbb25a01b097 100644
> --- a/fs/ocfs2/xattr.c
> +++ b/fs/ocfs2/xattr.c
> @@ -2476,9 +2476,9 @@ static int ocfs2_xattr_ibody_remove(struct inode *inode,
>  		.vb_access = ocfs2_journal_access_di,
>  	};
>  
> -	header = (struct ocfs2_xattr_header *)
> -		 ((void *)di + inode->i_sb->s_blocksize -
> -		 le16_to_cpu(di->i_xattr_inline_size));
> +	ret = ocfs2_xattr_ibody_lookup_header(inode, di, &header);
> +	if (ret)
> +		return ret;
>  
>  	ret = ocfs2_remove_value_outside(inode, &vb, header,
>  					 ref_ci, ref_root_bh);