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Merge pull request #43289 from tsmetana/adc-race-fix

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Automatic merge from submit-queue

Attach/detach controller: fix potential race in constructor

**What this PR does / why we need it**:
There is a potential race condition in the Attach/detach controller: The "constructor" first installs informer event handlers and then creates and initializes the other data structures. However there is no guarantee an event cannot arrive before the data structures required by the event handlers are ready. This may result in nil pointer derefernces and potential crashes (e.g. the nodeAdd method calls adc.actualStateOfWorld.SetNodeStatusUpdateNeeded even though the actualStateOfWorld might be still nil).

It should be enough just to move the event handlers installation at the end of the constructor function.

**Release note**:

```release-note
NONE
```
This commit is contained in:
Kubernetes Submit Queue 2017-03-31 17:30:36 -07:00 committed by GitHub
commit fff5fae0a0
1 changed files with 14 additions and 14 deletions
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28
pkg/controller/volume/attachdetach/attach_detach_controller.go
View File

@ -103,20 +103,6 @@ func NewAttachDetachController(
cloud: cloud,
}
podInformer.Informer().AddEventHandler(kcache.ResourceEventHandlerFuncs{
AddFunc: adc.podAdd,
UpdateFunc: adc.podUpdate,
DeleteFunc: adc.podDelete,
})
adc.podsSynced = podInformer.Informer().HasSynced
nodeInformer.Informer().AddEventHandler(kcache.ResourceEventHandlerFuncs{
AddFunc: adc.nodeAdd,
UpdateFunc: adc.nodeUpdate,
DeleteFunc: adc.nodeDelete,
})
adc.nodesSynced = nodeInformer.Informer().HasSynced
if err := adc.volumePluginMgr.InitPlugins(plugins, adc); err != nil {
return nil, fmt.Errorf("Could not initialize volume plugins for Attach/Detach Controller: %+v", err)
}
@ -153,6 +139,20 @@ func NewAttachDetachController(
podInformer.Lister(),
adc.desiredStateOfWorld)
podInformer.Informer().AddEventHandler(kcache.ResourceEventHandlerFuncs{
AddFunc: adc.podAdd,
UpdateFunc: adc.podUpdate,
DeleteFunc: adc.podDelete,
})
adc.podsSynced = podInformer.Informer().HasSynced
nodeInformer.Informer().AddEventHandler(kcache.ResourceEventHandlerFuncs{
AddFunc: adc.nodeAdd,
UpdateFunc: adc.nodeUpdate,
DeleteFunc: adc.nodeDelete,
})
adc.nodesSynced = nodeInformer.Informer().HasSynced
return adc, nil
}