Merge tag 'wq-for-6.14-rc2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq

Pull workqueue fix from Tejun Heo:

 - Fix a regression where a worker pool can be freed before rescuer
   workers are done with it leading to user-after-free

* tag 'wq-for-6.14-rc2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq:
  workqueue: Put the pwq after detaching the rescuer from the pool

Author: torvalds

kernel/workqueue.c

@@ -3516,12 +3516,6 @@ static int rescuer_thread(void *__rescuer)
 			}
 		}
 
-		/*
-		 * Put the reference grabbed by send_mayday().  @pool won't
-		 * go away while we're still attached to it.
-		 */
-		put_pwq(pwq);
-
 		/*
 		 * Leave this pool. Notify regular workers; otherwise, we end up
 		 * with 0 concurrency and stalling the execution.
@@ -3532,6 +3526,12 @@ static int rescuer_thread(void *__rescuer)
 
 		worker_detach_from_pool(rescuer);
 
+		/*
+		 * Put the reference grabbed by send_mayday().  @pool might
+		 * go away any time after it.
+		 */
+		put_pwq_unlocked(pwq);
+
 		raw_spin_lock_irq(&wq_mayday_lock);
 	}