linux-kernel - Re: [PATCH] HID: core: Reject report fields with a size or count of 0

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Message-ID: <bd033800-53f0-4d5a-a52b-b0e01ac48c12@rowland.harvard.edu>
Date: Mon, 21 Jul 2025 09:56:29 -0400
From: Alan Stern <stern@...land.harvard.edu>
To: Benjamin Tissoires <bentiss@...nel.org>
Cc: syzbot <syzbot+b63d677d63bcac06cf90@...kaller.appspotmail.com>,
	jikos@...nel.org, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [PATCH] HID: core: Reject report fields with a size or count of 0

On Mon, Jul 21, 2025 at 03:05:58PM +0200, Benjamin Tissoires wrote:
> > So then would it be better to accept these report fields (perhaps with a 
> > warning) and instead, harden the core HID code so that it doesn't choke 
> > when it runs across one of them?
> > 
> 
> Yeah, that seems like the best plan forward.
> 
> [sorry on reduced setup for the next 3 weeks, so I can't really debug
> the entire thing now.]
> 
> Though, we should probably not annoy users unless we are trying to do
> something that won't be needed. I doubt that Saitek gamepad will ever
> call the faulty functions, so why putting an error in the logs when it's
> working fine?

All right.

Probably the best way to do this is simply to revert the commit that's 
already applied and then merge a new patch to harden the core.  Would 
you like me to post the reversion patch or do you prefer to do it 
yourself?

Alan Stern