CVE-2023-53148

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> igb: Fix igb_down hung on surprise removal<br /> <br /> In a setup where a Thunderbolt hub connects to Ethernet and a display<br /> through USB Type-C, users may experience a hung task timeout when they<br /> remove the cable between the PC and the Thunderbolt hub.<br /> This is because the igb_down function is called multiple times when<br /> the Thunderbolt hub is unplugged. For example, the igb_io_error_detected<br /> triggers the first call, and the igb_remove triggers the second call.<br /> The second call to igb_down will block at napi_synchronize.<br /> Here&amp;#39;s the call trace:<br /> __schedule+0x3b0/0xddb<br /> ? __mod_timer+0x164/0x5d3<br /> schedule+0x44/0xa8<br /> schedule_timeout+0xb2/0x2a4<br /> ? run_local_timers+0x4e/0x4e<br /> msleep+0x31/0x38<br /> igb_down+0x12c/0x22a [igb 6615058754948bfde0bf01429257eb59f13030d4]<br /> __igb_close+0x6f/0x9c [igb 6615058754948bfde0bf01429257eb59f13030d4]<br /> igb_close+0x23/0x2b [igb 6615058754948bfde0bf01429257eb59f13030d4]<br /> __dev_close_many+0x95/0xec<br /> dev_close_many+0x6e/0x103<br /> unregister_netdevice_many+0x105/0x5b1<br /> unregister_netdevice_queue+0xc2/0x10d<br /> unregister_netdev+0x1c/0x23<br /> igb_remove+0xa7/0x11c [igb 6615058754948bfde0bf01429257eb59f13030d4]<br /> pci_device_remove+0x3f/0x9c<br /> device_release_driver_internal+0xfe/0x1b4<br /> pci_stop_bus_device+0x5b/0x7f<br /> pci_stop_bus_device+0x30/0x7f<br /> pci_stop_bus_device+0x30/0x7f<br /> pci_stop_and_remove_bus_device+0x12/0x19<br /> pciehp_unconfigure_device+0x76/0xe9<br /> pciehp_disable_slot+0x6e/0x131<br /> pciehp_handle_presence_or_link_change+0x7a/0x3f7<br /> pciehp_ist+0xbe/0x194<br /> irq_thread_fn+0x22/0x4d<br /> ? irq_thread+0x1fd/0x1fd<br /> irq_thread+0x17b/0x1fd<br /> ? irq_forced_thread_fn+0x5f/0x5f<br /> kthread+0x142/0x153<br /> ? __irq_get_irqchip_state+0x46/0x46<br /> ? kthread_associate_blkcg+0x71/0x71<br /> ret_from_fork+0x1f/0x30<br /> <br /> In this case, igb_io_error_detected detaches the network interface<br /> and requests a PCIE slot reset, however, the PCIE reset callback is<br /> not being invoked and thus the Ethernet connection breaks down.<br /> As the PCIE error in this case is a non-fatal one, requesting a<br /> slot reset can be avoided.<br /> This patch fixes the task hung issue and preserves Ethernet<br /> connection by ignoring non-fatal PCIE errors.