ubi: check kthread_should_stop() after the setting of task state

commit d005f8c6588efcfbe88099b6edafc6f58c84a9c1 upstream.

A detach hung is possible when a race occurs between the detach process
and the ubi background thread. The following sequences outline the race:

  ubi thread: if (list_empty(&ubi->works)...

  ubi detach: set_bit(KTHREAD_SHOULD_STOP, &kthread->flags)
              => by kthread_stop()
              wake_up_process()
              => ubi thread is still running, so 0 is returned

  ubi thread: set_current_state(TASK_INTERRUPTIBLE)
              schedule()
              => ubi thread will never be scheduled again

  ubi detach: wait_for_completion()
              => hung task!

To fix that, we need to check kthread_should_stop() after we set the
task state, so the ubi thread will either see the stop bit and exit or
the task state is reset to runnable such that it isn't scheduled out
indefinitely.

Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Cc: <stable@vger.kernel.org>
Fixes: 801c135ce73d5df1ca ("UBI: Unsorted Block Images")
Reported-by: syzbot+853639d0cb16c31c7a14@syzkaller.appspotmail.com
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c
index a8f74d9bba4ff82c6d3430e3656f90dc7d5c4b47..545a92eb8f56977dcd5f480e8ddbf0db6d1a4b05 100644 (file)
--- a/drivers/mtd/ubi/wl.c
+++ b/drivers/mtd/ubi/wl.c
@@ -1478,6 +1478,19 @@ int ubi_thread(void *u)
                    !ubi->thread_enabled || ubi_dbg_is_bgt_disabled(ubi)) {
                        set_current_state(TASK_INTERRUPTIBLE);
                        spin_unlock(&ubi->wl_lock);
+
+                       /*
+                        * Check kthread_should_stop() after we set the task
+                        * state to guarantee that we either see the stop bit
+                        * and exit or the task state is reset to runnable such
+                        * that it's not scheduled out indefinitely and detects
+                        * the stop bit at kthread_should_stop().
+                        */
+                       if (kthread_should_stop()) {
+                               set_current_state(TASK_RUNNING);
+                               break;
+                       }
+
                        schedule();
                        continue;
                }