[Qemu-devel] [PATCH 26/32] xhci: call set-address with dummy usbpacket

[Gerd Hoffmann <kraxel@redhat.com>]

Due to the way devices are addressed with xhci (done by hardware, not
the guest os) there is no packet when invoking the set-address control
request.  Create a dummy packet in that case to avoid null pointer
dereferences.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/usb/hcd-xhci.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
index 40542b8..9132920 100644
--- a/hw/usb/hcd-xhci.c
+++ b/hw/usb/hcd-xhci.c
@@ -1970,13 +1970,18 @@ static TRBCCode xhci_address_slot(XHCIState *xhci, unsigned int slotid,
     if (bsr) {
         slot_ctx[3] = SLOT_DEFAULT << SLOT_STATE_SHIFT;
     } else {
+        USBPacket p;
         slot->devaddr = xhci->devaddr++;
         slot_ctx[3] = (SLOT_ADDRESSED << SLOT_STATE_SHIFT) | slot->devaddr;
         DPRINTF("xhci: device address is %d\n", slot->devaddr);
         usb_device_reset(dev);
-        usb_device_handle_control(dev, NULL,
+        usb_packet_setup(&p, USB_TOKEN_OUT,
+                         usb_ep_get(dev, USB_TOKEN_OUT, 0),
+                         0, false, false);
+        usb_device_handle_control(dev, &p,
                                   DeviceOutRequest | USB_REQ_SET_ADDRESS,
                                   slot->devaddr, 0, 0, NULL);
+        assert(p.status != USB_RET_ASYNC);
     }
 
     res = xhci_enable_ep(xhci, slotid, 1, octx+32, ep0_ctx);
-- 
1.7.1