linux-kernel - Re: [PATCH] char: pcmcia: scr24x_cs: Fix use-after-free in scr24x

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Message-ID: <20220916081124.GA189795@ubuntu>
Date:   Fri, 16 Sep 2022 01:11:24 -0700
From:   Hyunwoo Kim <imv4bel@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Lubomir Rintel <lkundrak@...sk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, imv4bel@...il.com
Subject: Re: [PATCH] char: pcmcia: scr24x_cs: Fix use-after-free in
 scr24x_fops

On Fri, Sep 16, 2022 at 08:59:44AM +0200, Arnd Bergmann wrote:
> This appears to introduce a new use-after-free, when the kref_put()
> frees the 'dev' structure and you unlock the mutex in that structure
> afterwards.

yes. Every patch I've submitted has this issue.
I'll replace the mutex with a global variable and submit a v2 patch that fixes other issues.