linux-kernel - Re: [PATCH v1] HID: make arrays usage and value to be the same

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Message-ID: <nycvar.YFH.7.76.2101180911150.5622@cbobk.fhfr.pm>
Date:   Mon, 18 Jan 2021 09:11:33 +0100 (CET)
From:   Jiri Kosina <jikos@...nel.org>
To:     Will McVicker <willmcvicker@...gle.com>
cc:     Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        security@...nel.org, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-team@...roid.com,
        Will Coster <willcoster@...gle.com>
Subject: Re: [PATCH v1] HID: make arrays usage and value to be the same

On Sat, 5 Dec 2020, Will McVicker wrote:

> The HID subsystem allows an "HID report field" to have a different
> number of "values" and "usages" when it is allocated. When a field
> struct is created, the size of the usage array is guaranteed to be at
> least as large as the values array, but it may be larger. This leads to
> a potential out-of-bounds write in
> __hidinput_change_resolution_multipliers() and an out-of-bounds read in
> hidinput_count_leds().
> 
> To fix this, let's make sure that both the usage and value arrays are
> the same size.

Now applied, sorry for the delay and thanks for the fix.

-- 
Jiri Kosina
SUSE Labs