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parisc: led: Fix potential null-ptr-deref in start_task()

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commit 41f563ab3c33698bdfc3403c7c2e6c94e73681e4 upstream.

start_task() calls create_singlethread_workqueue() and not checked the
ret value, which may return NULL. And a null-ptr-deref may happen:

start_task()
    create_singlethread_workqueue() # failed, led_wq is NULL
    queue_delayed_work()
        queue_delayed_work_on()
            __queue_delayed_work()  # warning here, but continue
                __queue_work()      # access wq->flags, null-ptr-deref

Check the ret value and return -ENOMEM if it is NULL.

Fixes: 3499495205 ("[PARISC] Use work queue in LED/LCD driver instead of tasklet.")
Signed-off-by: Shang XiaoJing <shangxiaojing@huawei.com>
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shang XiaoJing 2022-11-17 10:45:14 +08:00 committed by Greg Kroah-Hartman
parent 662dc7c6be
commit 5e4500454d
1 changed files with 3 additions and 0 deletions
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3
drivers/parisc/led.c
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@ -137,6 +137,9 @@ static int start_task(void)
/* Create the work queue and queue the LED task */ /* Create the work queue and queue the LED task */
led_wq = create_singlethread_workqueue("led_wq"); led_wq = create_singlethread_workqueue("led_wq");
if (!led_wq)
return -ENOMEM;
queue_delayed_work(led_wq, &led_task, 0); queue_delayed_work(led_wq, &led_task, 0);
return 0; return 0;