Re: [PATCH] cgroup/rstat: validate cpu before css_rstat_cpu() access

[Tejun Heo]

On Fri, May 15, 2026 at 08:29:52PM +0800, Qing Ming wrote:
> @@ -90,6 +91,9 @@ __bpf_kfunc void css_rstat_updated(struct cgroup_subsys_state *css, int cpu)
>  	     !IS_ENABLED(CONFIG_ARCH_HAS_NMI_SAFE_THIS_CPU_OPS)) && in_nmi())
>  		return;
>  
> +	if (unlikely(cpu < 0 || cpu >= nr_cpu_ids || !cpu_possible(cpu)))
> +		return;
> +

Can you please add this validation to the BPF kfunc that's exposing it?

Thanks.

-- 
tejun