3.16.51-rc1 review patch. If anyone has any objections, please let me know.
------------------ From: Bjørn Mork <[email protected]> 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 <[email protected]> Acked-by: Oliver Neukum <[email protected]> Signed-off-by: David S. Miller <[email protected]> [bwh: Backported to 3.16: parsing code is organised differently] Signed-off-by: Ben Hutchings <[email protected]> --- --- a/drivers/net/usb/cdc_ether.c +++ b/drivers/net/usb/cdc_ether.c @@ -235,8 +235,9 @@ int usbnet_generic_cdc_bind(struct usbne info->ether->bLength); goto bad_desc; } - dev->hard_mtu = le16_to_cpu( - info->ether->wMaxSegmentSize); + if (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. */
