Make ehci_process_itd return an error in case we didn't do any actual iso transfer because we've found no active transaction. That'll avoid ehci happily run in circles forever if the guest builds a loop out of idts.
Reported-by: Qinghao Tang <luodalon...@gmail.com> Tested-by: P J P <ppan...@redhat.com> Signed-off-by: Gerd Hoffmann <kra...@redhat.com> --- hw/usb/hcd-ehci.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c index 4e2161b..d07f228 100644 --- a/hw/usb/hcd-ehci.c +++ b/hw/usb/hcd-ehci.c @@ -1389,7 +1389,7 @@ static int ehci_process_itd(EHCIState *ehci, { USBDevice *dev; USBEndpoint *ep; - uint32_t i, len, pid, dir, devaddr, endp; + uint32_t i, len, pid, dir, devaddr, endp, xfers = 0; uint32_t pg, off, ptr1, ptr2, max, mult; ehci->periodic_sched_active = PERIODIC_ACTIVE; @@ -1479,9 +1479,10 @@ static int ehci_process_itd(EHCIState *ehci, ehci_raise_irq(ehci, USBSTS_INT); } itd->transact[i] &= ~ITD_XACT_ACTIVE; + xfers++; } } - return 0; + return xfers ? 0 : -1; } -- 1.8.3.1