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qemu: fix segfault when detaching non-existent network device

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In qemuDomainDetachNetDevice, detach was being used before it had been
validated. If no matching device was found, this resulted in a
dereference of a NULL pointer.

This behavior was a regression introduced in commit
cf90342be0022520e25cfa258cef1034b229a100, so it has not been a part of
any official libvirt release.
This commit is contained in:
Guannan Ren 2012-03-12 23:50:02 +08:00 committed by Laine Stump
parent 041109afef
commit 19c7980ee6
1 changed files with 7 additions and 7 deletions
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14
src/qemu/qemu_hotplug.c
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@ -2081,13 +2081,6 @@ qemuDomainDetachNetDevice(struct qemud_driver *driver,
}
}
if (virDomainNetGetActualType(detach) == VIR_DOMAIN_NET_TYPE_HOSTDEV) {
ret = qemuDomainDetachThisHostDevice(driver, vm,
virDomainNetGetActualHostdev(detach),
-1);
goto cleanup;
}
if (!detach) {
qemuReportError(VIR_ERR_OPERATION_FAILED,
_("network device %02x:%02x:%02x:%02x:%02x:%02x not found"),
@ -2097,6 +2090,13 @@ qemuDomainDetachNetDevice(struct qemud_driver *driver,
goto cleanup;
}
if (virDomainNetGetActualType(detach) == VIR_DOMAIN_NET_TYPE_HOSTDEV) {
ret = qemuDomainDetachThisHostDevice(driver, vm,
virDomainNetGetActualHostdev(detach),
-1);
goto cleanup;
}
if (!virDomainDeviceAddressIsValid(&detach->info,
VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI)) {
qemuReportError(VIR_ERR_OPERATION_FAILED,