linux-kernel - Re: [PATCH 1/7] fs, xfs: convert xfs_bui_log_item.bui_refcount from atomic_t to refcount

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Message-ID: <20170221225534.GB23007@dastard>
Date:   Wed, 22 Feb 2017 09:55:34 +1100
From:   Dave Chinner <david@...morbit.com>
To:     Elena Reshetova <elena.reshetova@...el.com>
Cc:     linux-kernel@...r.kernel.org, linux-xfs@...r.kernel.org,
        peterz@...radead.org, gregkh@...uxfoundation.org,
        darrick.wong@...cle.com, Hans Liljestrand <ishkamiel@...il.com>,
        Kees Cook <keescook@...omium.org>,
        David Windsor <dwindsor@...il.com>
Subject: Re: [PATCH 1/7] fs, xfs: convert xfs_bui_log_item.bui_refcount from
 atomic_t to refcount_t

On Tue, Feb 21, 2017 at 05:49:01PM +0200, Elena Reshetova wrote:
> refcount_t type and corresponding API should be
> used instead of atomic_t when the variable is used as
> a reference counter. This allows to avoid accidental
> refcounter overflows that might lead to use-after-free
> situations.

I'm missing something: how do you overflow a log item object
reference count?

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com