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As demonstrated by the fix for update_port_device_state, commit12783c0b9e("usb: core: Prevent null pointer dereference in update_port_device_state"), usb_hub_to_struct_hub() can return NULL in certain scenarios, such as during hub driver unbind or teardown race conditions, even if the underlying usb_device structure exists. Plus, all other places that call usb_hub_to_struct_hub() in the same file do check for NULL return values. If usb_hub_to_struct_hub() returns NULL, the subsequent access to hub->ports[udev->portnum - 1] will cause a null pointer dereference. Signed-off-by: Chenyuan Yang <chenyuan0y@gmail.com> Fixes:f1bfb4a6fe("usb: acpi: add device link between tunneled USB3 device and USB4 Host Interface") Acked-by: Alan Stern <stern@rowland.harvard.edu> Link: https://lore.kernel.org/r/20250417195032.1811338-1-chenyuan0y@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>