linux-kernel - Re: [PATCH v2] HID: mcp-2221: prevent UAF in delayed work

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Message-ID: <nycvar.YFH.7.76.2302201009430.1142@cbobk.fhfr.pm>
Date:   Mon, 20 Feb 2023 10:09:59 +0100 (CET)
From:   Jiri Kosina <jikos@...nel.org>
To:     Benjamin Tissoires <benjamin.tissoires@...hat.com>
cc:     Rishi Gupta <gupt21@...il.com>,
        Pietro Borrello <borrello@...g.uniroma1.it>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] HID: mcp-2221: prevent UAF in delayed work

On Thu, 16 Feb 2023, Benjamin Tissoires wrote:

> If the device is plugged/unplugged without giving time for mcp_init_work()
> to complete, we might kick in the devm free code path and thus have
> unavailable struct mcp_2221 while in delayed work.
> 
> Canceling the delayed_work item is enough to solve the issue, because
> cancel_delayed_work_sync will prevent the work item to requeue itself.
> 
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>

Acked-by: Jiri Kosina <jkosina@...e.cz>

Thanks Benjamin.

-- 
Jiri Kosina
SUSE Labs