netdev - Re: [PATCH net,stable] usbnet: ignore endpoints with invalid wMaxPacketSize

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Message-ID: <20190920190303.149da58a@cakuba.netronome.com>
Date:   Fri, 20 Sep 2019 19:03:03 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Bjørn Mork <bjorn@...k.no>
Cc:     netdev@...r.kernel.org, linux-usb@...r.kernel.org,
        Oliver Neukum <oliver@...kum.org>
Subject: Re: [PATCH net,stable] usbnet: ignore endpoints with invalid
 wMaxPacketSize

On Wed, 18 Sep 2019 14:17:38 +0200, Bjørn Mork wrote:
> Endpoints with zero wMaxPacketSize are not usable for transferring
> data. Ignore such endpoints when looking for valid in, out and
> status pipes, to make the drivers more robust against invalid and
> meaningless descriptors.
> 
> The wMaxPacketSize of these endpoints are used for memory allocations
> and as divisors in many usbnet minidrivers. Avoiding zero is therefore
> critical.
> 
> Signed-off-by: Bjørn Mork <bjorn@...k.no>

Fixes tag would be useful. I'm not sure how far into stable we should
backport this.

Is this something that occurs on real devices or protection from
malicious ones?