CVE-2022-50498

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

eth: alx: take rtnl_lock on resume

Zbynek reports that alx trips an rtnl assertion on resume:

 RTNL: assertion failed at net/core/dev.c (2891)
 RIP: 0010:netif_set_real_num_tx_queues+0x1ac/0x1c0
 Call Trace:
  <TASK>
  __alx_open+0x230/0x570 [alx]
  alx_resume+0x54/0x80 [alx]
  ? pci_legacy_resume+0x80/0x80
  dpm_run_callback+0x4a/0x150
  device_resume+0x8b/0x190
  async_resume+0x19/0x30
  async_run_entry_fn+0x30/0x130
  process_one_work+0x1e5/0x3b0

indeed the driver does not hold rtnl_lock during its internal close
and re-open functions during suspend/resume. Note that this is not
a huge bug as the driver implements its own locking, and does not
implement changing the number of queues, but we need to silence
the splat.