net: lan966x: Fix potential null-ptr-deref in lan966x_stats_init()

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: net: lan966x: Fix potential null-ptr-deref in lan966x_stats_init() lan966x_stats_init() calls create_singlethread_workqueue() and not checked the ret value, which may return NULL. And a null-ptr-deref may happen: lan966x_stats_init() create_singlethread_workqueue() # failed, lan966x->stats_queue 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.

References

• https://git.kernel.org/stable/c/4a43c1c6040e848e1344c7b16ac696b68fbc439c
• https://git.kernel.org/stable/c/ba86af3733aece88dbcee0dfebf7e2dcfefb2be4