linux-kernel - Re: [PATCH net] netkit: Assign missing bpf_net

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Message-ID: <e1435276-d106-411f-9c0f-c98abd2bce08@linux.dev>
Date: Fri, 13 Sep 2024 10:24:09 -0700
From: Martin KaFai Lau <martin.lau@...ux.dev>
To: Breno Leitao <leitao@...ian.org>
Cc: kuba@...nel.org, bpf@...r.kernel.org,
 Daniel Borkmann <daniel@...earbox.net>,
 Nikolay Aleksandrov <razor@...ckwall.org>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Paolo Abeni <pabeni@...hat.com>, Alexei Starovoitov <ast@...nel.org>,
 Toke Høiland-Jørgensen <toke@...hat.com>,
 Jesper Dangaard Brouer <hawk@...nel.org>,
 Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
 vadim.fedorenko@...ux.dev, andrii@...nel.org,
 "open list:BPF [NETKIT] (BPF-programmable network device)"
 <netdev@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net] netkit: Assign missing bpf_net_context

On 9/12/24 8:56 AM, Breno Leitao wrote:
> 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.

Acked-by: Martin KaFai Lau <martin.lau@...nel.org>