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qemu: prevent invalid reads in qemuAssignDevicePCISlots

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Don't reserve slot 2 for video if the machine has no PCI buses.
Error out when the user specifies a video device without
a PCI address when there are no PCI buses.

(This wouldn't work on a machine with no PCI bus anyway since
we do add PCI addresses for video devices to the command line)
This commit is contained in:
Ján Tomko 2013-04-26 18:05:46 +02:00
parent 877bc08947
commit 379e4bcce5
1 changed files with 4 additions and 1 deletions
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5
src/qemu/qemu_command.c
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@ -1909,6 +1909,9 @@ qemuAssignDevicePCISlots(virDomainDefPtr def,
primaryVideo->info.addr.pci.function = 0;
addrptr = &primaryVideo->info.addr.pci;
if (!qemuPCIAddressValidate(addrs, addrptr))
goto error;
if (qemuDomainPCIAddressSlotInUse(addrs, addrptr)) {
if (qemuDeviceVideoUsable) {
virResetLastError();
@ -1935,7 +1938,7 @@ qemuAssignDevicePCISlots(virDomainDefPtr def,
/* If TYPE==PCI, then qemuCollectPCIAddress() function
* has already reserved the address, so we must skip */
}
} else if (!qemuDeviceVideoUsable) {
} else if (addrs->nbuses && !qemuDeviceVideoUsable) {
memset(&tmp_addr, 0, sizeof(tmp_addr));
tmp_addr.slot = 2;