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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>
hifive-unleashed-5.1
Mathias Nyman 2018-11-09 17:21:18 +02:00 committed by Greg Kroah-Hartman
parent f068090426
commit 1245374e9b
1 changed files with 7 additions and 0 deletions
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7
drivers/usb/host/xhci-ring.c
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@ -1556,6 +1556,13 @@ static void handle_port_status(struct xhci_hcd *xhci,
goto cleanup;
}
/* We might get interrupts after shared_hcd is removed */
if (port->rhub == &xhci->usb3_rhub && xhci->shared_hcd == NULL) {
xhci_dbg(xhci, "ignore port event for removed USB3 hcd\n");
bogus_port_status = true;
goto cleanup;
}
hcd = port->rhub->hcd;
bus_state = &xhci->bus_state[hcd_index(hcd)];
hcd_portnum = port->hcd_portnum;