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

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Message-Id: <20171108.134447.1632260346431831673.davem@davemloft.net>
Date:   Wed, 08 Nov 2017 13:44:47 +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: qmi_wwan: fix divide by 0 on bad
 descriptors

From: Bjørn Mork <bjorn@...k.no>
Date: Mon,  6 Nov 2017 15:32:18 +0100

> A CDC Ethernet functional descriptor with wMaxSegmentSize = 0 will
> cause a divide error in usbnet_probe:
> 
> divide error: 0000 [#1] PREEMPT SMP KASAN
 ...
> Fix by simply ignoring the bogus descriptor, as it is optional
> for QMI devices anyway.
> 
> Fixes: 423ce8caab7e ("net: usb: qmi_wwan: New driver for Huawei QMI based WWAN devices")
> Reported-by: Andrey Konovalov <andreyknvl@...gle.com>
> Signed-off-by: Bjørn Mork <bjorn@...k.no>

Applied and queued up for -stable.