CVE-2022-50133: In the Linux kernel, the following vulnerability has been resolved:  usb: xhci_plat_remove: avoid NULL dereference  Since commit 4736ebd7fcaff1eb8481c140ba494962847d6e0a ("usb: host: xhci-plat: omit shared hcd if either root hub has no ports") xhci->shared_hcd can be NULL, which causes the following Oops on reboot:  [  710.124450] systemd-shutdown[1]: Rebooting. [  710.298861] xhci-hcd xhci-hcd.2.auto: remove, state 4 [  710.304217] usb usb3: USB disconnect, device number 1 [  710.317441] xhci-hcd xhci-hcd.2.auto: USB bus 3 deregistered [  710.323280] xhci-hcd xhci-hcd.2.auto: remove, state 1 [  710.328401] usb usb2: USB disconnect, device number 1 [  710.333515] usb 2-3: USB disconnect, device number 2 [  710.467649] xhci-hcd xhci-hcd.2.auto: USB bus 2 deregistered [  710.475450] Unable to handle kernel NULL pointer dereference at virtual address 00000000000003b8 [  710.484425] Mem abort info: [  710.487265]   ESR = 0x0000000096000004 [  710.491060]   EC = 0x25: DABT (current EL), IL = 32 bits [  710.496427]   SET = 0, FnV = 0 [  710.499525]   EA = 0, S1PTW = 0 [  710.502716]   FSC = 0x04: level 0 translation fault [  710.507648] Data abort info: [  710.510577]   ISV = 0, ISS = 0x00000004 [  710.514462]   CM = 0, WnR = 0 [  710.517480] user pgtable: 4k pages, 48-bit VAs, pgdp=00000008b0050000 [  710.523976] [00000000000003b8] pgd=0000000000000000, p4d=0000000000000000 [  710.530961] Internal error: Oops: 96000004 [#1] PREEMPT SMP [  710.536551] Modules linked in: rfkill input_leds snd_soc_simple_card snd_soc_simple_card_utils snd_soc_nau8822 designware_i2s snd_soc_core dw_hdmi_ahb_audio snd_pcm_dmaengine arm_ccn panfrost ac97_bus gpu_sched snd_pcm at24 fuse configfs sdhci_of_dwcmshc sdhci_pltfm sdhci nvme led_class mmc_core nvme_core bt1_pvt polynomial tp_serio snd_seq_midi snd_seq_midi_event snd_seq snd_timer snd_rawmidi snd_seq_device snd soundcore efivarfs ipv6 [  710.575286] CPU: 7 PID: 1 Comm: systemd-shutdow Not tainted 5.19.0-rc7-00043-gfd8619f4fd54 #1 [  710.583822] Hardware name: T-Platforms TF307-MB/BM1BM1-A, BIOS 5.6 07/06/2022 [  710.590972] pstate: 40000005 (nZcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [  710.597949] pc : usb_remove_hcd+0x34/0x1e4 [  710.602067] lr : xhci_plat_remove+0x74/0x140 [  710.606351] sp : ffff800009f3b7c0 [  710.609674] x29: ffff800009f3b7c0 x28: ffff000800960040 x27: 0000000000000000 [  710.616833] x26: ffff800008dc22a0 x25: 0000000000000000 x24: 0000000000000000 [  710.623992] x23: 0000000000000000 x22: ffff000805465810 x21: ffff000805465800 [  710.631149] x20: ffff000800f80000 x19: 0000000000000000 x18: ffffffffffffffff [  710.638307] x17: ffff000805096000 x16: ffff00080633b800 x15: ffff000806537a1c [  710.645465] x14: 0000000000000001 x13: 0000000000000000 x12: ffff00080378d6f0 [  710.652621] x11: ffff00080041a900 x10: ffff800009b204e8 x9 : ffff8000088abaa4 [  710.659779] x8 : ffff000800960040 x7 : ffff800009409000 x6 : 0000000000000001 [  710.666936] x5 : ffff800009241000 x4 : ffff800009241440 x3 : 0000000000000000 [  710.674094] x2 : ffff000800960040 x1 : ffff000800960040 x0 : 0000000000000000 [  710.681251] Call trace: [  710.683704]  usb_remove_hcd+0x34/0x1e4 [  710.687467]  xhci_plat_remove+0x74/0x140 [  710.691400]  platform_remove+0x34/0x70 [  710.695165]  device_remove+0x54/0x90 [  710.698753]  device_release_driver_internal+0x200/0x270 [  710.703992]  device_release_driver+0x24/0x30 [  710.708273]  bus_remove_device+0xe0/0x16c [  710.712293]  device_del+0x178/0x390 [  710.715797]  platform_device_del.part.0+0x24/0x90 [  710.720514]  platform_device_unregister+0x30/0x50 [  710.725232]  dwc3_host_exit+0x20/0x30 [  710.728907]  dwc3_remove+0x174/0x1b0 [  710.732494]  platform_remove+0x34/0x70 [  710.736254]  device_remove+0x54/0x90 [  710.739840]  device_release_driver_internal+0x200/0x270 [  710.745078]  device_release_driver+0x24/0x30 [  710.749359]  bus_remove_device+0xe0/0x16c [  710.753380]  device_del+0x178/0x390 [  710.756881]  platform_device_del.part ---truncated---