Re: [PATCH net v1] net: nexthop: fix panic when IPv4 route references IPv6 nexthop

[David Ahern]

On 2/28/26 6:57 PM, Jiayuan Chen wrote:
> diff --git a/net/ipv6/route.c b/net/ipv6/route.c
> index c0350d97307e..4e7c44101709 100644
> --- a/net/ipv6/route.c
> +++ b/net/ipv6/route.c
> @@ -3643,6 +3643,12 @@ int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
>                                 goto out;
>                         }
>                 }
> +               fib6_nh->nh_common.nhc_pcpu_rth_output =
> +                       alloc_percpu_gfp(struct rtable __rcu *, gfp_flags);
> +               if (!fib6_nh->nh_common.nhc_pcpu_rth_output) {
> +                       err = -ENOMEM;
> +                       goto out;
> +               }
>                 goto pcpu_alloc;
>         }
> 
>

Already done by  fib6_nh_init -> fib_nh_common_init():

        nhc->nhc_pcpu_rth_output = alloc_percpu_gfp(struct rtable __rcu *,
                                                    gfp_flags);
        if (!nhc->nhc_pcpu_rth_output)
                return -ENOMEM;