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authorMathias Nyman <mathias.nyman@linux.intel.com>2018-11-09 17:21:18 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-11-09 08:31:08 -0800
commit1245374e9b8340fc255fd51b2015173a83050d03 (patch)
tree0964dff2c46a81e815dee36b9437c296462e561f /drivers/usb
parentf068090426ea8d72c408ebd42953a82a88e2282c (diff)
downloadlinux-1245374e9b8340fc255fd51b2015173a83050d03.tar.bz2
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>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/host/xhci-ring.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index a8d92c90fb58..80d464ea5a9a 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -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;