i40e: Fix freeing of uninitialized misc IRQ vector

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

i40e: Fix freeing of uninitialized misc IRQ vector

When VSI set up failed in i40e_probe() as part of PF switch set up

driver was trying to free misc IRQ vectors in

i40e_clear_interrupt_scheme and produced a kernel Oops:

Trying to free already-free IRQ 266

WARNING: CPU: 0 PID: 5 at kernel/irq/manage.c:1731 __free_irq+0x9a/0x300

Workqueue: events work_for_cpu_fn

RIP: 0010:__free_irq+0x9a/0x300

Call Trace:

? synchronize_irq+0x3a/0xa0

free_irq+0x2e/0x60

i40e_clear_interrupt_scheme+0x53/0x190 [i40e]

i40e_probe.part.108+0x134b/0x1a40 [i40e]

? kmem_cache_alloc+0x158/0x1c0

? acpi_ut_update_ref_count.part.1+0x8e/0x345

? acpi_ut_update_object_reference+0x15e/0x1e2

? strstr+0x21/0x70

? irq_get_irq_data+0xa/0x20

? mp_check_pin_attr+0x13/0xc0

? irq_get_irq_data+0xa/0x20

? mp_map_pin_to_irq+0xd3/0x2f0

? acpi_register_gsi_ioapic+0x93/0x170

? pci_conf1_read+0xa4/0x100

? pci_bus_read_config_word+0x49/0x70

? do_pci_enable_device+0xcc/0x100

local_pci_probe+0x41/0x90

work_for_cpu_fn+0x16/0x20

process_one_work+0x1a7/0x360

worker_thread+0x1cf/0x390

? create_worker+0x1a0/0x1a0

kthread+0x112/0x130

? kthread_flush_work_fn+0x10/0x10

ret_from_fork+0x1f/0x40

The problem is that at that point misc IRQ vectors

were not allocated yet and we get a call trace

that driver is trying to free already free IRQ vectors.

Add a check in i40e_clear_interrupt_scheme for __I40E_MISC_IRQ_REQUESTED

PF state before calling i40e_free_misc_vector. This state is set only if

misc IRQ vectors were properly initialized.