CVE-2021-47283

In the Linux kernel, the following vulnerability has been resolved:
net:sfc: fix non-freed irq in legacy irq mode SFC driver can be configured
via modparam to work using MSI-X, MSI or legacy IRQ interrupts. In the last
one, the interrupt was not properly released on module remove. It was not
freed because the flag irqs_hooked was not set during initialization in the
case of using legacy IRQ. Example of (trimmed) trace during module remove
without this fix: remove_proc_entry: removing non-empty directory
‘irq/125’, leaking at least ‘0000:3b:00.1’ WARNING: CPU: 39 PID: 3658 at
fs/proc/generic.c:715 remove_proc_entry+0x15c/0x170 …trimmed… Call
Trace: unregister_irq_proc+0xe3/0x100 free_desc+0x29/0x70
irq_free_descs+0x47/0x70 mp_unmap_irq+0x58/0x60
acpi_unregister_gsi_ioapic+0x2a/0x40 acpi_pci_irq_disable+0x78/0xb0
pci_disable_device+0xd1/0x100 efx_pci_remove+0xa1/0x1e0 [sfc]
pci_device_remove+0x38/0xa0 __device_release_driver+0x177/0x230
driver_detach+0xcb/0x110 bus_remove_driver+0x58/0xd0
pci_unregister_driver+0x2a/0xb0 efx_exit_module+0x24/0xf40 [sfc]
__do_sys_delete_module.constprop.0+0x171/0x280 ?
exit_to_user_mode_prepare+0x83/0x1d0 do_syscall_64+0x3d/0x80
entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f9f9385800b
…trimmed…