linux-kernel - Re: [RESEND PATCH] Input: elantech - Fix stack out of bound access in elantech_change_report

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Message-ID: <YZNsoj7Onbxr68OQ@ninjato>
Date:   Tue, 16 Nov 2021 09:32:34 +0100
From:   Wolfram Sang <wsa@...nel.org>
To:     Andrea Righi <andrea.righi@...onical.com>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Phoenix Huang <phoenix@....com.tw>, jingle.wu@....com.tw,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH] Input: elantech - Fix stack out of bound access
 in elantech_change_report_id()

On Tue, Nov 16, 2021 at 08:22:23AM +0100, Andrea Righi wrote:
> The array param[] in elantech_change_report_id() must be at least 3
> bytes, because elantech_read_reg_params() is calling ps2_command() with
> PSMOUSE_CMD_GETINFO, that is going to access 3 bytes from param[], but
> it's defined in the stack as an array of 2 bytes, therefore we have a
> potential stack out-of-bounds access here, also confirmed by KASAN:

I think a comment in the code why the array size is 3 when only 2 values
are defined would be helpful. Like a short summary of the above.


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