[PATCH 4/5] xhci: Add an assertion to check for virt_dev=0 bug.

[Matt Evans <matt@ozlabs.org>]

During a "plug-unplug" stress test on an NEC xHCI card, a null pointer
dereference was observed.  xhci_address_device() dereferenced a null
virt_dev (possibly an erroneous udev->slot_id?); this patch adds a WARN_ON &
message to aid debug if it can be recreated.

Signed-off-by: Matt Evans <matt@ozlabs.org>
---
 drivers/usb/host/xhci.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 88e6298..7d43456 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -2542,6 +2542,17 @@ int xhci_address_device(struct usb_hcd *hcd, struct usb_device *udev)
 
 	virt_dev = xhci->devs[udev->slot_id];
 
+	if (WARN_ON(!virt_dev)) {
+		/*
+		 * In plug/unplug torture test with an NEC controller,
+		 * a zero-dereference was observed once due to virt_dev = 0.
+		 * Print useful debug rather than crash if it is observed again!
+		 */
+		xhci_warn(xhci, "Virt dev invalid for slot_id 0x%x!\n",
+			udev->slot_id);
+		return -EINVAL;
+	}
+
 	slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->in_ctx);
 	/*
 	 * If this is the first Set Address since device plug-in or
-- 
1.7.0.4