Re: [PATCH net] net: ethernet: fix use after free bug in ns83820_remove_one due to race condition

[Jakub Kicinski]

On Thu,  9 Mar 2023 17:42:31 +0800 Zheng Wang wrote:
> +	cancel_work_sync(&dev->tq_refill);
>  	ns83820_disable_interrupts(dev); /* paranoia */
>  
>  	unregister_netdev(ndev);

Canceling the work before unregister can't work.
Please take a closer look, the work to refill a ring should be
canceled when the ring itself is dismantled.