linux-kernel - Re: [RFC][PATCH] timers: Add del_time_free() to be called before freeing timers

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Date:   Fri, 08 Apr 2022 23:46:34 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>, jstultz@...gle.com,
        Stephen Boyd <sboyd@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Guenter Roeck <linux@...ck-us.net>
Subject: Re: [RFC][PATCH] timers: Add del_time_free() to be called before
 freeing timers

On Fri, Apr 08 2022 at 16:58, Steven Rostedt wrote:

> On Fri, 08 Apr 2022 22:29:58 +0200
> Thomas Gleixner <tglx@...utronix.de> wrote:
>
>> What a shutdown function would prevent here is UAF, but I'm not entirely
>> sure whether it will simplify coordinated shutdown and remove the
>> requirement of a priv->shutdown flag all over the place. It might make
>> some of the driver muck just get stuck in the shutdown, but that's
>> definitely an improvement over a potential UAF which happens every blue
>> moons.
>
> Note, it is the cause of a large percentage of crash reports reported by
> ChromeOS.
>
> And we do not even know if it was this bluetooth issue that caused them.
> There's evidence they are mostly caused by the wifi code. I only used the
> bluetooth issue because it was the first one we found that looked obviously
> wrong.

I'm sure that there are hundres more...