Re: [PATCH net] netkit: Assign missing bpf_net_context

[Toke Høiland-Jørgensen]

Breno Leitao <leitao@xxxxxxxxxx> writes:

> During the introduction of struct bpf_net_context handling for
> XDP-redirect, the netkit driver has been missed, which also requires it
> because NETKIT_REDIRECT invokes skb_do_redirect() which is accessing the
> per-CPU variables. Otherwise we see the following crash:
>
> 	BUG: kernel NULL pointer dereference, address: 0000000000000038
> 	bpf_redirect()
> 	netkit_xmit()
> 	dev_hard_start_xmit()
>
> Set the bpf_net_context before invoking netkit_xmit() program within the
> netkit driver.
>
> Fixes: 401cb7dae813 ("net: Reference bpf_redirect_info via task_struct on PREEMPT_RT.")
> Signed-off-by: Breno Leitao <leitao@xxxxxxxxxx>
> Acked-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
> Reviewed-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>

Reviewed-by: Toke Høiland-Jørgensen <toke@xxxxxxxxxx>