CVE-2021-47283

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