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Merge pull request #47900 from yiqinguo/yiqinguo_add_type_judgment

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Automatic merge from submit-queue

Add type conversion judgment

If do not type conversion judgment, there may be panic.

**Release note**:
```release-note
NONE
```
This commit is contained in:
Kubernetes Submit Queue 2017-06-29 04:00:18 -07:00 committed by GitHub
commit c9ad8dcde0
1 changed files with 4 additions and 1 deletions
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5
pkg/kubelet/dockershim/docker_service.go
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@ -455,10 +455,13 @@ func (ds *dockerService) getDockerVersionFromCache() (*dockertypes.Version, erro
// We only store on key in the cache.
const dummyKey = "version"
value, err := ds.versionCache.Get(dummyKey)
dv := value.(*dockertypes.Version)
if err != nil {
return nil, err
}
dv, ok := value.(*dockertypes.Version)
if !ok {
return nil, fmt.Errorf("Converted to *dockertype.Version error")
}
return dv, nil
}