net: cdc_ether: fix divide by 0 on bad descriptors
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>
This commit is contained in:
parent
b5f862180d
commit
2cb80187ba
|
@ -230,7 +230,7 @@ skip:
|
||||||
goto bad_desc;
|
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);
|
dev->hard_mtu = le16_to_cpu(info->ether->wMaxSegmentSize);
|
||||||
/* because of Zaurus, we may be ignoring the host
|
/* because of Zaurus, we may be ignoring the host
|
||||||
* side link address we were given.
|
* side link address we were given.
|
||||||
|
|
Loading…
Reference in a new issue