linux-kernel - Re: [PATCH] HID: magicmouse: Do not crash on missing msc->input

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Message-ID: <p9o1r5o6-3051-865n-3432-p507pqn9o3s6@xreary.bet>
Date: Sat, 10 Jan 2026 10:27:46 +0100 (CET)
From: Jiri Kosina <jikos@...nel.org>
To: Günther Noack <gnoack@...gle.com>
cc: Benjamin Tissoires <bentiss@...nel.org>, stable@...r.kernel.org, 
    linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] HID: magicmouse: Do not crash on missing msc->input

On Fri, 9 Jan 2026, Günther Noack wrote:

> Fake USB devices can send their own report descriptors for which the
> input_mapping() hook does not get called.  In this case, msc->input stays N=
> ULL,
> leading to a crash at a later time.
> 
> Detect this condition in the input_configured() hook and reject the device.
> 
> This is not supposed to happen with actual magic mouse devices, but can be
> provoked by imposing as a magic mouse USB device.

Applied to hid.git#for-6.19/upstream-fixes, thanks Guenther.

-- 
Jiri Kosina
SUSE Labs