Re: [PATCH net-next 1/2] ipv6: add ipv6_fragment hook in ipv6_stub

[Marcelo Ricardo Leitner]

On Thu, Aug 27, 2020 at 07:51:47AM -0700, David Miller wrote:
> From: we...@ucloud.cn
> Date: Thu, 27 Aug 2020 18:39:51 +0800
> 
> > From: wenxu <we...@ucloud.cn>
> > 
> > Add ipv6_fragment to ipv6_stub to avoid calling netfilter when
> > access ip6_fragment.
> > 
> > Signed-off-by: wenxu <we...@ucloud.cn>
> 
> Please test these changes with ipv6 disabled.
> 
> It will crash, you have to update the default stub in
> net/ipv6/addrconf_core.c as well.

I didn't test it myself but I'm not seeing how the crash could happen.
The next patch does check for it being NULL before using it:

-               if (!v6ops)
+               if (!ipv6_stub->ipv6_fragment)
                        goto err;

Wenxu?

  Marcelo