CVE-2023-53148

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

igb: Fix igb_down hung on surprise removal

In a setup where a Thunderbolt hub connects to Ethernet and a display through USB Type-C, users may experience a hung task timeout when they remove the cable between the PC and the Thunderbolt hub. This is because the igbdown function is called multiple times when the Thunderbolt hub is unplugged. For example, the igbioerrordetected triggers the first call, and the igbremove triggers the second call. The second call to igbdown will block at napi_synchronize. Here's the call trace: __schedule+0x3b0/0xddb ? __modtimer+0x164/0x5d3 schedule+0x44/0xa8 scheduletimeout+0xb2/0x2a4 ? runlocaltimers+0x4e/0x4e msleep+0x31/0x38 igb_down+0x12c/0x22a [igb 6615058754948bfde0bf01429257eb59f13030d4] __igbclose+0x6f/0x9c [igb 6615058754948bfde0bf01429257eb59f13030d4] igbclose+0x23/0x2b [igb 6615058754948bfde0bf01429257eb59f13030d4] __devclosemany+0x95/0xec devclosemany+0x6e/0x103 unregisternetdevicemany+0x105/0x5b1 unregisternetdevicequeue+0xc2/0x10d unregisternetdev+0x1c/0x23 igbremove+0xa7/0x11c [igb 6615058754948bfde0bf01429257eb59f13030d4] pcideviceremove+0x3f/0x9c devicereleasedriverinternal+0xfe/0x1b4 pcistopbusdevice+0x5b/0x7f pcistopbusdevice+0x30/0x7f pcistopbusdevice+0x30/0x7f pcistopandremovebusdevice+0x12/0x19 pciehpunconfiguredevice+0x76/0xe9 pciehpdisableslot+0x6e/0x131 pciehphandlepresenceorlinkchange+0x7a/0x3f7 pciehpist+0xbe/0x194 irqthreadfn+0x22/0x4d ? irqthread+0x1fd/0x1fd irqthread+0x17b/0x1fd ? irqforcedthreadfn+0x5f/0x5f kthread+0x142/0x153 ? _irqgetirqchipstate+0x46/0x46 ? kthreadassociateblkcg+0x71/0x71 retfromfork+0x1f/0x30

In this case, igbioerror_detected detaches the network interface and requests a PCIE slot reset, however, the PCIE reset callback is not being invoked and thus the Ethernet connection breaks down. As the PCIE error in this case is a non-fatal one, requesting a slot reset can be avoided. This patch fixes the task hung issue and preserves Ethernet connection by ignoring non-fatal PCIE errors.