linux-kernel - Re: [PATCH 5.4 17/78] HID: Fix slab-out-of-bounds read in hid_field

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Date:   Wed, 5 Feb 2020 10:00:58 -0500 (EST)
From:   Alan Stern <stern@...land.harvard.edu>
To:     Jiri Kosina <jikos@...nel.org>
cc:     "Enderborg, Peter" <Peter.Enderborg@...y.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "syzbot+09ef48aa58261464b621@...kaller.appspotmail.com" 
        <syzbot+09ef48aa58261464b621@...kaller.appspotmail.com>
Subject: Re: [PATCH 5.4 17/78] HID: Fix slab-out-of-bounds read in
 hid_field_extract (Broken!)

On Wed, 5 Feb 2020, Jiri Kosina wrote:

> On Wed, 5 Feb 2020, Enderborg, Peter wrote:
> 
> > >> This patch breaks Elgato StreamDeck.
> >
> > > Does that mean the device is broken with a too-large of a report?
> > 
> > Yes.
> 
> In which way does the breakage pop up? Are you getting "report too long" 
> errors in dmesg, or the device just doesn't enumerate at all?
> 
> Could you please post /sys/kernel/debug/hid/<device>/rdesc contents, and 
> if the device is at least semi-alive, also contents of 
> /sys/kernel/debug/hid/<device>/events from the time it misbehaves?

Also, please post the output from "lsusb -v" for the StreamDeck.

Alan Stern