Re: [PATCH net v2] net: stmmac: Fix accessing freed irq affinity_hint

On Tue, 18 Mar 2025 11:24:23 +0800 Qingfang Deng wrote:

• cpumask_clear(&cpu_mask);
  

• cpumask_set_cpu(i % num_online_cpus(), &cpu_mask);
  

• irq_set_affinity_hint(priv->rx_irq[i], &cpu_mask);
  

• irq_set_affinity_hint(priv->rx_irq[i],
  

• 		      cpumask_of(i % num_online_cpus()));
  

This does fix the bug you're targeting, but FWIW num_online_cpus() is not great in general. The online CPU mask can be sparse. You may want to look into finding 'nth' online CPU instead of the naive modulo as a follow up.