linux-hardening - Re: [PATCH 13/19] fs: convert kill_block_super to block_free

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Message-ID: <20230914022956.GG800259@ZenIV>
Date:   Thu, 14 Sep 2023 03:29:56 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Christoph Hellwig <hch@....de>
Cc:     Christian Brauner <brauner@...nel.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>,
        Tejun Heo <tj@...nel.org>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Damien Le Moal <dlemoal@...nel.org>,
        Naohiro Aota <naohiro.aota@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-nfs@...r.kernel.org, linux-hardening@...r.kernel.org,
        cgroups@...r.kernel.org
Subject: Re: [PATCH 13/19] fs: convert kill_block_super to block_free_sb

On Wed, Sep 13, 2023 at 08:10:07AM -0300, Christoph Hellwig wrote:

> -static void affs_kill_sb(struct super_block *sb)
> +static void affs_free_sb(struct super_block *sb)
>  {
>  	struct affs_sb_info *sbi = AFFS_SB(sb);
> -	kill_block_super(sb);
> +
> +	block_free_sb(sb);
>  	if (sbi) {
>  		affs_free_bitmap(sb);
>  		affs_brelse(sbi->s_root_bh);

<checks>

Yep, that's printk + brelse()...  Could we have that
block_free_sb() (an awful name aside) done after the
if (sbi) { ... } there?