Re: [PATCH v2] io_uring: fix use-after-free of sq->thread in __io_uring_show_fdinfo()

[Keith Busch]

On Tue, Jun 10, 2025 at 10:18:01AM -0700, Penglei Jiang wrote:
> @@ -379,7 +380,8 @@ static int io_sq_thread(void *data)
>  		io_sq_tw(&retry_list, UINT_MAX);
>  
>  	io_uring_cancel_generic(true, sqd);
> -	sqd->thread = NULL;
> +	rcu_assign_pointer(sqd->thread, NULL);

I believe this will fail a sparse check without adding the "__rcu" type
annotation on the struct's "thread" member.