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| author | Felix Moessbauer <felix.moessbauer@siemens.com> | 2024-09-16 13:11:50 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-10-04 16:29:44 +0200 |
| commit | 01ad0576f09210a8d1232077c4058e587e4e26cb (patch) | |
| tree | 782d968630f7b9c87954f15b0486f88dde69e395 /io_uring | |
| parent | 859f62a2f904d916488bbc62fe8d1b13e749b4e8 (diff) | |
| download | linux-01ad0576f09210a8d1232077c4058e587e4e26cb.tar.gz linux-01ad0576f09210a8d1232077c4058e587e4e26cb.tar.bz2 linux-01ad0576f09210a8d1232077c4058e587e4e26cb.zip | |
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 <felix.moessbauer@siemens.com>
Link: https://lore.kernel.org/r/20240916111150.1266191-1-felix.moessbauer@siemens.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'io_uring')
| -rw-r--r-- | io_uring/sqpoll.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/io_uring/sqpoll.c b/io_uring/sqpoll.c index 545789386d52..cdf8b567cb94 100644 --- a/io_uring/sqpoll.c +++ b/io_uring/sqpoll.c @@ -402,15 +402,22 @@ __cold 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; |