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 10:54:44 +0100 (CET)
From:   Jiri Kosina <jikos@...nel.org>
To:     "Enderborg, Peter" <Peter.Enderborg@...y.com>
cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Alan Stern <stern@...land.harvard.edu>,
        "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, 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?

> > Is it broken in Linus's tree?  If so, can you work with the HID
> > developers to fix it there so we can backport the fix to all stable
> > trees?
> 
> I cant see that there are any other fixes upon this so I dont think so. 
> I can try.
>
> 
> Jiri is in the loop. I guess he is the "HID developers" ?

Thanks,

-- 
Jiri Kosina
SUSE Labs