linux-kernel - Re: [PATCH] kernfs: Convert from atomic_t to refcount_t on kernfs

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Date:   Wed, 21 Jul 2021 17:36:20 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Xiyu Yang <xiyuyang19@...an.edu.cn>
Cc:     Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org,
        yuanxzhang@...an.edu.cn, Xin Tan <tanxin.ctf@...il.com>
Subject: Re: [PATCH] kernfs: Convert from atomic_t to refcount_t on
 kernfs_node->count

On Mon, Jul 19, 2021 at 04:33:21PM +0800, Xiyu Yang wrote:
> refcount_t type and corresponding API can protect refcounters from
> accidental underflow and overflow and further use-after-free situations.

But this really is a count, not a refcount.

So are you _sure_ this should be changed?

What did you to do to test this?

thanks,

greg k-h