On Tue, Sep 18, 2018 at 2:09 PM Eric Dumazet <eric.duma...@gmail.com> wrote: > > > > On 09/14/2018 07:46 AM, Petar Penkov wrote: > > From: Petar Penkov <ppen...@google.com> > > > > Adds a hook for programs of type BPF_PROG_TYPE_FLOW_DISSECTOR and > > attach type BPF_FLOW_DISSECTOR that is executed in the flow dissector > > path. The BPF program is per-network namespace > > ... > > > > > + rcu_read_lock(); > > + attached = skb ? > > rcu_dereference(dev_net(skb->dev)->flow_dissector_prog) > > + : NULL; > > > Some skbs have a NULL skb->dev, so we are going to crash here.
Ai. Thanks, Eric. For these cases, we can probably infer the netns from sk->sk_net. That is assuming that all skbs have at least one of skb->sk or skb->dev set.
