usb: xhci: fix wild pointers in xhci_mem_cleanup

This patch fixes some wild pointers produced by xhci_mem_cleanup.
These wild pointers will cause system crash if xhci_mem_cleanup()
is called twice.

Reported-and-tested-by: Pengcheng Li <lpc.li@hisilicon.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 80c1de239e9a..bad0d1f9a41d 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -1861,6 +1861,12 @@ no_bw:
         kfree(xhci->rh_bw);
         kfree(xhci->ext_caps);
 
+        xhci->usb2_ports = NULL;
+        xhci->usb3_ports = NULL;
+        xhci->port_array = NULL;
+        xhci->rh_bw = NULL;
+        xhci->ext_caps = NULL;
+
         xhci->page_size = 0;
         xhci->page_shift = 0;
         xhci->bus_state[0].bus_suspended = 0;