linux-kernel - Re: [PATCH] exfat: Fix use after free in exfat_load_upcase

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Message-ID: <20200608155243.GX19604@bombadil.infradead.org>
Date:   Mon, 8 Jun 2020 08:52:43 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Markus Elfring <Markus.Elfring@....de>
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        linux-fsdevel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Namjae Jeon <namjae.jeon@...sung.com>,
        Sungjong Seo <sj1557.seo@...sung.com>,
        Tetsuhiro Kohada <kohada.t2@...il.com>
Subject: Re: [PATCH] exfat: Fix use after free in exfat_load_upcase_table()

On Mon, Jun 08, 2020 at 05:07:33PM +0200, Markus Elfring wrote:
> > This code calls brelse(bh) and then dereferences "bh" on the next line
> > resulting in a possible use after free.
> 
> There is an unfortunate function call sequence.
> 
> 
> > The brelse() should just be moved down a line.
> 
> How do you think about a wording variant like the following?
> 
>    Thus move a call of the function “brelse” one line down.
> 
> 
> Would you like to omit a word from the patch subject so that
> a typo will be avoided there?

Markus, please go away.  This comment is entirely unhelpful.