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ehci: check device is not NULL before calling usb_ep_get() 

In ehci_process_itd(), the call to ehci_find_device() can return NULL
if it doesn't find a device matching 'devaddr' so explicitly check
the return value before passing it to usb_ep_get().

Signed-off-by: Liam Merwick <liam.merwick@oracle.com>
Message-id: 1549460216-25808-5-git-send-email-liam.merwick@oracle.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Liam Merwick 2019-02-06 13:36:51 +00:00 committed by Gerd Hoffmann
parent 7cb513aa34
commit e94682f1fe
1 changed files with 5 additions and 2 deletions
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7
hw/usb/hcd-ehci.c
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@ -1439,9 +1439,12 @@ static int ehci_process_itd(EHCIState *ehci,
qemu_sglist_add(&ehci->isgl, ptr1 + off, len);
}
pid = dir ? USB_TOKEN_IN : USB_TOKEN_OUT;
dev = ehci_find_device(ehci, devaddr);
if (dev == NULL) {
ehci_trace_guest_bug(ehci, "no device found");
return -1;
}
pid = dir ? USB_TOKEN_IN : USB_TOKEN_OUT;
ep = usb_ep_get(dev, pid, endp);
if (ep && ep->type == USB_ENDPOINT_XFER_ISOC) {
usb_packet_setup(&ehci->ipacket, pid, ep, 0, addr, false,