linux-kernel - Re: [PATCH] Input: synaptics-rmi4 - validate that the rmi_dev pointer is set before dereferencing it

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Message-ID: <20191029041947.GG57214@dtor-ws>
Date:   Mon, 28 Oct 2019 21:19:47 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Andrew Duggan <aduggan@...aptics.com>
Cc:     "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Federico Cerutti <federico@...es-c.it>,
        Christopher Heiny <Cheiny@...aptics.com>
Subject: Re: [PATCH] Input: synaptics-rmi4 - validate that the rmi_dev
 pointer is set before dereferencing it

Hi Andrew,

On Wed, Oct 23, 2019 at 01:24:05AM +0000, Andrew Duggan wrote:
> A bug in hid-rmi was causing rmi_unregister_transport_device() to be
> called even if the call to rmi_register_transport_device() failed to
> allocate the rmi device. A patch has been submitted to fix the issue in
> hid-rmi. This patch will ensure that should a simialr situation
> occur then the rmi driver will not dereference a NULL pointer.

This looks like "garbage in, garbage out" problem where we should not be
calling unregister in the first place. I'd rather not apply this.

Thanks.

-- 
Dmitry