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| author | Liam Merwick <liam.merwick@oracle.com> | 2019-02-06 13:36:52 +0000 |
|---|---|---|
| committer | Gerd Hoffmann <kraxel@redhat.com> | 2019-02-20 09:41:23 +0100 |
| commit | 42340fc31f1533207bfd53f9d922624c4fbcf91d (patch) | |
| tree | 5078bd60b99d4114293fc2ba2779971277aab0c9 | |
| parent | e94682f1febe3cc95cbe144137dd35eae39dc1e0 (diff) | |
| download | qemu-42340fc31f1533207bfd53f9d922624c4fbcf91d.zip qemu-42340fc31f1533207bfd53f9d922624c4fbcf91d.tar.gz qemu-42340fc31f1533207bfd53f9d922624c4fbcf91d.tar.bz2 | |
ohci: check device is not NULL before calling usb_ep_get()
A call to ohci_find_device() can return NULL if it doesn't find a
device matching 'addr' so for the two callers, explicitly check
the return value before passing it to usb_ep_get().
Signed-off-by: Liam Merwick <liam.merwick@oracle.com>
Message-id: 1549460216-25808-6-git-send-email-liam.merwick@oracle.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
| -rw-r--r-- | hw/usb/hcd-ohci.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/hw/usb/hcd-ohci.c b/hw/usb/hcd-ohci.c index c34cf5b..196a9f7 100644 --- a/hw/usb/hcd-ohci.c +++ b/hw/usb/hcd-ohci.c @@ -848,6 +848,10 @@ static int ohci_service_iso_td(OHCIState *ohci, struct ohci_ed *ed, bool int_req = relative_frame_number == frame_count && OHCI_BM(iso_td.flags, TD_DI) == 0; dev = ohci_find_device(ohci, OHCI_BM(ed->flags, ED_FA)); + if (dev == NULL) { + trace_usb_ohci_td_dev_error(); + return 1; + } ep = usb_ep_get(dev, pid, OHCI_BM(ed->flags, ED_EN)); usb_packet_setup(&ohci->usb_packet, pid, ep, 0, addr, false, int_req); usb_packet_addbuf(&ohci->usb_packet, ohci->usb_buf, len); @@ -1071,6 +1075,10 @@ static int ohci_service_td(OHCIState *ohci, struct ohci_ed *ed) return 1; } dev = ohci_find_device(ohci, OHCI_BM(ed->flags, ED_FA)); + if (dev == NULL) { + trace_usb_ohci_td_dev_error(); + return 1; + } ep = usb_ep_get(dev, pid, OHCI_BM(ed->flags, ED_EN)); usb_packet_setup(&ohci->usb_packet, pid, ep, 0, addr, !flag_r, OHCI_BM(td.flags, TD_DI) == 0); |