netdev - Re: [PATCH net,stable] net: cdc_ether: fix divide by 0 on bad descriptors

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Message-Id: <20171108.134457.1511127836664128982.davem@davemloft.net>
Date:   Wed, 08 Nov 2017 13:44:57 +0900 (KST)
From:   David Miller <davem@...emloft.net>
To:     bjorn@...k.no
Cc:     netdev@...r.kernel.org, linux-usb@...r.kernel.org,
        oneukum@...e.com, dvyukov@...gle.com, kcc@...gle.com,
        syzkaller@...glegroups.com
Subject: Re: [PATCH net,stable] net: cdc_ether: fix divide by 0 on bad
 descriptors

From: Bjørn Mork <bjorn@...k.no>
Date: Mon,  6 Nov 2017 15:37:22 +0100

> Setting dev->hard_mtu to 0 will cause a divide error in
> usbnet_probe. Protect against devices with bogus CDC Ethernet
> functional descriptors by ignoring a zero wMaxSegmentSize.
> 
> Signed-off-by: Bjørn Mork <bjorn@...k.no>

Applied and queued up for -stable.