From: Bjørn Mork <bjorn@mork.no>
Date: Mon, 6 Nov 2017 14:37:22 +0000 (+0100)
Subject: net: cdc_ether: fix divide by 0 on bad descriptors
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d7d24810ac55e2f3fb213d6acf80016a0d337c50;p=pandora-kernel.git

net: cdc_ether: fix divide by 0 on bad descriptors

commit 2cb80187ba065d7decad7c6614e35e07aec8a974 upstream.

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@mork.no>
Acked-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[bwh: Backported to 3.2: parsing code is organised differently]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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