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workqueue: Fix unbound pool lifetime for pending pwqs

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KASAN reports a use-after-free of an unbound worker_pool in
node_activate_pending_pwq():

  BUG: KASAN: slab-use-after-free in _raw_spin_trylock+0x6d/0x120
  Read of size 4 at addr ffff8880089ce000 by task kworker/u22:0/318

  CPU: 1 UID: 0 PID: 318 Comm: kworker/u22:0 Not tainted 7.2.0 #1 PREEMPT(lazy)
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
  Workqueue:  0x0 (flush-8:0)
  Call Trace:
   <TASK>
   dump_stack_lvl+0x53/0x70
   print_report+0xce/0x610
   kasan_report+0xce/0x100
   _raw_spin_trylock+0x6d/0x120
   pwq_dec_nr_in_flight+0x4b4/0xcb0
   process_one_work+0x921/0x11a0
   worker_thread+0x4d0/0xd20
   kthread+0x2de/0x3c0
   ret_from_fork+0x3aa/0x620
   ret_from_fork_asm+0x1a/0x30
   </TASK>

  Allocated by task 311:
   alloc_pwq+0x439/0xca0
   apply_wqattrs_prepare+0x75e/0xd10
   apply_workqueue_attrs_locked+0x44/0xa0
   wq_nice_store+0x350/0x450

  Freed by task 0:
   kfree+0x127/0x3b0
   rcu_core+0x523/0x1780
   handle_softirqs+0x1b3/0x610

  Last potentially related work creation:
   put_unbound_pool+0x3f3/0x7d0
   pwq_release_workfn+0x494/0x8e0
   kthread_worker_fn+0x1ff/0x790

Canceling the last inactive work skips pwq_dec_nr_active(), so an empty
pwq can remain on pending_pwqs when its refcnt reaches zero.
pwq_release_workfn() currently puts the pool before removing that pwq.
If this drops the last pool reference, the pool can be RCU-freed while
the pwq remains reachable, and node_activate_pending_pwq() may trylock
the freed pool->lock.

Remove the pwq from pending_pwqs before putting the pool.

Fixes: 5797b1c189 ("workqueue: Implement system-wide nr_active enforcement for unbound workqueues")
Cc: stable@vger.kernel.org
Signed-off-by: Yao Kai <yaokai34@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Yao Kai 2026-08-24 11:58:52 +08:00 committed by Tejun Heo
parent 7e2f2a377a
commit cf9c8aaea0
1 changed files with 6 additions and 6 deletions
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12
kernel/workqueue.c
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@ -5294,12 +5294,6 @@ static void pwq_release_workfn(struct kthread_work *work)
mutex_unlock(&wq->mutex);
}
if (!is_percpu_pool(pool)) {
mutex_lock(&wq_pool_mutex);
put_unbound_pool(pool);
mutex_unlock(&wq_pool_mutex);
}
if (!list_empty(&pwq->pending_node)) {
struct wq_node_nr_active *nna =
wq_node_nr_active(pwq->wq, pwq->pool->node);
@ -5309,6 +5303,12 @@ static void pwq_release_workfn(struct kthread_work *work)
raw_spin_unlock_irq(&nna->lock);
}
if (!is_percpu_pool(pool)) {
mutex_lock(&wq_pool_mutex);
put_unbound_pool(pool);
mutex_unlock(&wq_pool_mutex);
}
kfree_rcu(pwq, rcu);
/*