From: Felix Moessbauer Date: Thu, 17 Oct 2024 11:50:29 +0000 (+0200) Subject: io_uring/sqpoll: do not put cpumask on stack X-Git-Tag: v5.10.228~39 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=b12ef2d4dfee3ca13258388868d9b78f3fae1c33;p=thirdparty%2Fkernel%2Fstable.git io_uring/sqpoll: do not put cpumask on stack commit 7f44beadcc11adb98220556d2ddbe9c97aa6d42d upstream. Putting the cpumask on the stack is deprecated for a long time (since 2d3854a37e8), as these can be big. Given that, change the on-stack allocation of allowed_mask to be dynamically allocated. Fixes: f011c9cf04c0 ("io_uring/sqpoll: do not allow pinning outside of cpuset") Signed-off-by: Felix Moessbauer Link: https://lore.kernel.org/r/20240916111150.1266191-1-felix.moessbauer@siemens.com Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index b670895e5a37f..502a8e201400d 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -8572,15 +8572,22 @@ static int io_sq_offload_create(struct io_ring_ctx *ctx, return 0; if (p->flags & IORING_SETUP_SQ_AFF) { - struct cpumask allowed_mask; + cpumask_var_t allowed_mask; int cpu = p->sq_thread_cpu; ret = -EINVAL; if (cpu >= nr_cpu_ids || !cpu_online(cpu)) goto err_sqpoll; - cpuset_cpus_allowed(current, &allowed_mask); - if (!cpumask_test_cpu(cpu, &allowed_mask)) + ret = -ENOMEM; + if (!alloc_cpumask_var(&allowed_mask, GFP_KERNEL)) + goto err_sqpoll; + ret = -EINVAL; + cpuset_cpus_allowed(current, allowed_mask); + if (!cpumask_test_cpu(cpu, allowed_mask)) { + free_cpumask_var(allowed_mask); goto err_sqpoll; + } + free_cpumask_var(allowed_mask); sqd->sq_cpu = cpu; } else { sqd->sq_cpu = -1;