From: Mathias Nyman mathias.nyman@linux.intel.com
commit 1245374e9b8340fc255fd51b2015173a83050d03 upstream.
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 Cc: Macpaul Lin macpaul.lin@mediatek.com [redone for 4.14.y based on Mathias's comments] Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/usb/host/xhci-ring.c | 6 ++++++ 1 file changed, 6 insertions(+)
--- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -1640,6 +1640,12 @@ static void handle_port_status(struct xh if ((major_revision == 0x03) != (hcd->speed >= HCD_USB3)) hcd = xhci->shared_hcd;
+ if (!hcd) { + xhci_dbg(xhci, "No hcd found for port %u event\n", port_id); + bogus_port_status = true; + goto cleanup; + } + if (major_revision == 0) { xhci_warn(xhci, "Event for port %u not in " "Extended Capabilities, ignoring.\n",