diff options
| author | Gerd Hoffmann <kraxel@redhat.com> | 2013-07-31 10:54:11 +0200 |
|---|---|---|
| committer | Gerd Hoffmann <kraxel@redhat.com> | 2013-08-01 13:03:42 +0200 |
| commit | 75cc1c1fcba1987bdf3979c4289ab756c2b15742 (patch) | |
| tree | 1c893fb96c94fde4338a5296d806476a9d154b48 /hw/usb/hcd-xhci.c | |
| parent | 75e2a4baf1536682d111d9bee0261806737a32dc (diff) | |
| download | qemu-75cc1c1fcba1987bdf3979c4289ab756c2b15742.zip | |
xhci: fix segfault
Guest trying to reset a endpoint of a disconnected device resulted in
xhci trying to dereference uport while being NULL, thereby crashing
qemu. Fix that by adding a check. Drop unused dev variable while
touching that code bit.
Cc: qemu-stable@nongnu.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Diffstat (limited to 'hw/usb/hcd-xhci.c')
| -rw-r--r-- | hw/usb/hcd-xhci.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c index 7cbf813696..ff5f68135c 100644 --- a/hw/usb/hcd-xhci.c +++ b/hw/usb/hcd-xhci.c @@ -1429,7 +1429,6 @@ static TRBCCode xhci_reset_ep(XHCIState *xhci, unsigned int slotid, { XHCISlot *slot; XHCIEPContext *epctx; - USBDevice *dev; trace_usb_xhci_ep_reset(slotid, epid); assert(slotid >= 1 && slotid <= xhci->numslots); @@ -1465,8 +1464,8 @@ static TRBCCode xhci_reset_ep(XHCIState *xhci, unsigned int slotid, ep |= 0x80; } - dev = xhci->slots[slotid-1].uport->dev; - if (!dev) { + if (!xhci->slots[slotid-1].uport || + !xhci->slots[slotid-1].uport->dev) { return CC_USB_TRANSACTION_ERROR; } |