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net: cdc_ether: fix divide by 0 on bad descriptors

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commit 2cb80187ba 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>
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bjørn Mork 2017-11-06 15:37:22 +01:00 committed by Greg Kroah-Hartman
parent 46bdabbca0
commit caeeef8438
1 changed files with 1 additions and 1 deletions
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2
drivers/net/usb/cdc_ether.c
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@ -221,7 +221,7 @@ int usbnet_generic_cdc_bind(struct usbnet *dev, struct usb_interface *intf)
goto bad_desc;
}
if (header.usb_cdc_ether_desc) {
if (header.usb_cdc_ether_desc && info->ether->wMaxSegmentSize) {
dev->hard_mtu = le16_to_cpu(info->ether->wMaxSegmentSize);
/* because of Zaurus, we may be ignoring the host
* side link address we were given.