3.16.51-rc1 review patch. If anyone has any objections, please let me know.
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From: Bjørn Mork bjorn@mork.no
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 3.16: parsing code is organised differently] Signed-off-by: Ben Hutchings ben@decadent.org.uk --- --- 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. */