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xhci: handle port status events for removed USB3 hcd
At xhci removal the USB3 hcd (shared_hcd) is removed before the primary USB2 hcd. Interrupts for port status changes may still occur for USB3 ports after the shared_hcd is freed, causing NULL pointer dereference. Check if xhci->shared_hcd is still valid before handing USB3 port events Cc: <stable@vger.kernel.org> Reported-by: Peter Chen <peter.chen@nxp.com> Tested-by: Jack Pham <jackp@codeaurora.org> Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -1556,6 +1556,13 @@ static void handle_port_status(struct xhci_hcd *xhci,
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goto cleanup;
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}
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/* We might get interrupts after shared_hcd is removed */
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if (port->rhub == &xhci->usb3_rhub && xhci->shared_hcd == NULL) {
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xhci_dbg(xhci, "ignore port event for removed USB3 hcd\n");
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bogus_port_status = true;
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goto cleanup;
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}
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hcd = port->rhub->hcd;
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bus_state = &xhci->bus_state[hcd_index(hcd)];
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hcd_portnum = port->hcd_portnum;
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