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xhci: fix segfault

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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>
This commit is contained in:
Gerd Hoffmann 2013-07-31 10:54:11 +02:00
parent 75e2a4baf1
commit 75cc1c1fcb
1 changed files with 2 additions and 3 deletions
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5
hw/usb/hcd-xhci.c
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@ -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;
}