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-rw-r--r--hw/usb/hcd-ehci.c3
-rw-r--r--hw/usb/hcd-xhci.c7
2 files changed, 8 insertions, 2 deletions
diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c
index 0134232627..e5acfc5ba5 100644
--- a/hw/usb/hcd-ehci.c
+++ b/hw/usb/hcd-ehci.c
@@ -1672,7 +1672,8 @@ static EHCIQueue *ehci_state_fetchqh(EHCIState *ehci, int async)
         ehci_set_state(ehci, async, EST_HORIZONTALQH);
 
     } else if ((q->qh.token & QTD_TOKEN_ACTIVE) &&
-               (NLPTR_TBIT(q->qh.current_qtd) == 0)) {
+               (NLPTR_TBIT(q->qh.current_qtd) == 0) &&
+               (q->qh.current_qtd != 0)) {
         q->qtdaddr = q->qh.current_qtd;
         ehci_set_state(ehci, async, EST_FETCHQTD);
 
diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
index 721beb5486..8f1a01a405 100644
--- a/hw/usb/hcd-xhci.c
+++ b/hw/usb/hcd-xhci.c
@@ -1954,7 +1954,12 @@ static void xhci_kick_epctx(XHCIEPContext *epctx, unsigned int streamid)
         for (i = 0; i < length; i++) {
             TRBType type;
             type = xhci_ring_fetch(xhci, ring, &xfer->trbs[i], NULL);
-            assert(type);
+            if (!type) {
+                xhci_die(xhci);
+                xhci_ep_free_xfer(xfer);
+                epctx->kick_active--;
+                return;
+            }
         }
         xfer->streamid = streamid;