xhci: Fix null pointer dereference when host dies

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: xhci: Fix null pointer dereference when host dies Make sure xhci_free_dev() and xhci_kill_endpoint_urbs() do not race and cause null pointer dereference when host suddenly dies. Usb core may call xhci_free_dev() which frees the xhci->devs[slot_id] virt device at the same time that xhci_kill_endpoint_urbs() tries to loop through all the device's endpoints, checking if there are any cancelled urbs left to give back. hold the xhci spinlock while freeing the virt device

References

• https://git.kernel.org/stable/c/6fac4b5cecb3928a0a81069aaa815a2edc8dd5a1
• https://git.kernel.org/stable/c/133b902378e4acbd824c29dd0d48570ad596e368
• https://git.kernel.org/stable/c/081105213ff6f661c114781d469233c7d0e09c2e
• https://git.kernel.org/stable/c/c462ac871f49753eca86bb960f573b993976a5ea
• https://git.kernel.org/stable/c/ea2ee5e9991caf74e0604f994c1831a5867055b2
• https://git.kernel.org/stable/c/a2bc47c43e70cf904b1af49f76d572326c08bca7