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Date:   Fri, 4 Sep 2020 16:39:47 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        Daniel Borkmann <borkmann@...earbox.net>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        John Fastabend <john.fastabend@...il.com>
Subject: Re: [PATCH bpf-next] bpf: don't check against device MTU in
 __bpf_skb_max_len

On Fri, 04 Sep 2020 11:30:28 +0200 Jesper Dangaard Brouer wrote:
> @@ -3211,8 +3211,7 @@ static int bpf_skb_net_shrink(struct sk_buff *skb, u32 off, u32 len_diff,
>  
>  static u32 __bpf_skb_max_len(const struct sk_buff *skb)
>  {
> -	return skb->dev ? skb->dev->mtu + skb->dev->hard_header_len :
> -			  SKB_MAX_ALLOC;
> +	return SKB_MAX_ALLOC;
>  }
>  
>  BPF_CALL_4(bpf_skb_adjust_room, struct sk_buff *, skb, s32, len_diff,
> 

Looks familiar:

https://lore.kernel.org/netdev/20200420231427.63894-1-zenczykowski@gmail.com/

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