CVE-2022-50415

In the Linux kernel, the following vulnerability has been resolved:

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

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

starttask() createsinglethreadworkqueue() # failed, ledwq is NULL queuedelayedwork() queuedelayedwork_on() __queuedelayedwork() # warning here, but continue _queuework() # access wq->flags, null-ptr-deref

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