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

At 2011-3-23 20:25, Eric Blake Write:
On 03/22/2011 08:02 PM, Wen Congyang wrote:
Steps to reproduce this bug:
# cat usb.xml
<hostdev mode='subsystem' type='usb'>
     <address bus='0x001' device='0x003'/>
# 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.

          usbDevice *usb;
-        qemuCgroupData data = { vm, cgroup };
+        qemuCgroupData data;

          if (virCgroupForDomain(driver->cgroup, vm->def->name,&cgroup, 0) !=0 ) {
@@ -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;

ACK. Latent bug introduced in commit b4d3434f, exposed by commit
f2512684.  (That explains why I didn't see it - when I tested b4d3434f,
nothing dereferenced the NULL, and my testing of f2512684 wasn't as

Thanks. Pushed.

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