[libvirt] [PATCH] Initialization error of qemuCgroupData in Qemu host usb hotplug

[Wen Congyang]

Steps to reproduce this bug:
# cat usb.xml 
<hostdev mode='subsystem' type='usb'>
  <source>
    <address bus='0x001' device='0x003'/>
  </source>
</hostdev>
# virsh attach-device vm1 usb.xml
error: Failed to attach device from usb.xml
error: server closed connection: 

The reason of this bug is that we set data.cgroup to NULL, and this will cause
libvirtd crashed.

Signed-off-by: Wen Congyang <wency at cn.fujitsu.com>

---
 src/qemu/qemu_hotplug.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index 36b343d..9082515 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -860,7 +860,7 @@ int qemuDomainAttachHostUsbDevice(struct qemud_driver *driver,
     if (qemuCgroupControllerActive(driver, VIR_CGROUP_CONTROLLER_DEVICES)) {
         virCgroupPtr cgroup = NULL;
         usbDevice *usb;
-        qemuCgroupData data = { vm, cgroup };
+        qemuCgroupData data;
 
         if (virCgroupForDomain(driver->cgroup, vm->def->name, &cgroup, 0) !=0 ) {
             qemuReportError(VIR_ERR_INTERNAL_ERROR,
@@ -873,6 +873,8 @@ int qemuDomainAttachHostUsbDevice(struct qemud_driver *driver,
                                 hostdev->source.subsys.u.usb.device)) == NULL)
             goto error;
 
+        data.vm = vm;
+        data.cgroup = cgroup;
         if (usbDeviceFileIterate(usb, qemuSetupHostUsbDeviceCgroup, &data) < 0)
             goto error;
     }
-- 
1.7.1