From: Josh Elsasser <jelsas...@appneta.com> Date: Mon, 12 Mar 2018 22:32:00 -0700
> init_dummy_netdev() leaves its netdev_ops pointer zeroed. This leads > to a NULL pointer dereference when sk_busy_loop fires against an iwlwifi > wireless adapter and checks napi->dev->netdev_ops->ndo_busy_poll. > > Avoid this by ensuring napi->dev->netdev_ops is valid before following > the pointer, avoiding the following panic when busy polling on a dummy > netdev: ... > Commit 79e7fff47b7b ("net: remove support for per driver ndo_busy_poll()") > indirectly fixed this upstream in linux-4.11 by removing the offending > pointer usage. No other users of napi->dev touch its netdev_ops. > > Fixes: 060212928670 ("net: add low latency socket poll") > Fixes: ce6aea93f751 ("net: network drivers no longer need to implement > ndo_busy_poll()") - 4.9.y > Signed-off-by: Josh Elsasser <jelsas...@appneta.com> Ok, queued up for -stable, thanks.