Merge pull request #57830 from hzxuzhonghu/buf-fix

Automatic merge from submit-queue (batch tested with PRs 56971, 57570, 57830, 57742). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. fix possible panic in kube-aggregator **What this PR does / why we need it**: https://github.com/kubernetes/kubernetes/blob/91dc55562c9e7742a1cfdaa6d1db0b1ce262ff95/staging/src/k8s.io/kube-aggregator/pkg/apiserver/handler_proxy.go#L210 If startup kube-aggregator as a standalone process. `r.proxyTransport ` is uninitialized, so `r.proxyTransport.Dial` will panic. **Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*: Fixes # **Special notes for your reviewer**: **Release note**: ```release-note NONE ```

Merge pull request #57830 from hzxuzhonghu/buf-fix
4cadc319 · Kubernetes Submit Queue · GitHub · 8c6f770e · 91dc5556 · 4cadc319
Unverified Commit 4cadc319 authored Jan 04, 2018 by Kubernetes Submit Queue Committed by GitHub Jan 04, 2018
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handler_proxy.go ...src/k8s.io/kube-aggregator/pkg/apiserver/handler_proxy.go +1 -1

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--- a/staging/src/k8s.io/kube-aggregator/pkg/apiserver/handler_proxy.go
+++ b/staging/src/k8s.io/kube-aggregator/pkg/apiserver/handler_proxy.go
@@ -207,7 +207,7 @@ func (r *proxyHandler) updateAPIService(apiService *apiregistrationapi.APIServic
 		serviceNamespace: apiService.Spec.Service.Namespace,
 	}
 	newInfo.proxyRoundTripper, newInfo.transportBuildingError = restclient.TransportFor(newInfo.restConfig)
-	if newInfo.transportBuildingError == nil && r.proxyTransport.Dial != nil {
+	if newInfo.transportBuildingError == nil && r.proxyTransport != nil && r.proxyTransport.Dial != nil {
 		switch transport := newInfo.proxyRoundTripper.(type) {
 		case *http.Transport:
 			transport.Dial = r.proxyTransport.Dial