Re: [PATCH v6 bpf-next 1/2] bpf: Fix the null pointer dereference issue in bpf_lwt_xmit_push_encap

[Feng Yang]

On Mon, 23 Feb 2026 13:39:51 -0800, Martin KaFai Lau wrote:

...
> Please check if the v5 discussion make sense (fix in test_run.c). It 
> should be something simpler than v5, e.g. always assign a dst to skb for 
> is_lwt case. I think always using net->ipv6.ip6_null_entry should work 
> but it needs to check ipv6 mod is loaded/enabled before using. Checking 
> 'ipv6_bpf_stub' should do. I don't think we need to complicate things 
> for v4 only kernel in test_run. I don't think testing skb->protocol 
> matters also from looking at bpf_lwt_push_ip_encap but please check.


Sure, I'll check, modify, and test it. Thanks.