[jira] [Resolved] (CLOUDSTACK-10356) Fix Some Potential NPE

["Rafael Weingärtner (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CLOUDSTACK-10356?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rafael Weingärtner resolved CLOUDSTACK-10356.
---------------------------------------------
    Resolution: Fixed

> Fix Some Potential NPE 
> -----------------------
>
>                 Key: CLOUDSTACK-10356
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-10356
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the default.) 
>    Affects Versions: 4.12.0.0
>            Reporter: lujie
>            Priority: Major
>         Attachments: CLOUDSTACK-10356_1.patch
>
>
> We have developed a static analysis tool [NPEDetector|https://github.com/lujiefsi/NPEDetector] to find some potential NPE. Our analysis shows that some callees may return null in corner case(e.g. node crash , IO exception), some of their callers have  _!=null_ check but some do not have. In this issue we post a patch which can add  !=null  based on existed !=null  check. For example:
> Callee GlobalLoadBalancingRulesServiceImpl#lookupGslbServiceProvider:
> {code:java}
> protected GslbServiceProvider lookupGslbServiceProvider() {
>     return _gslbProviders.size() == 0 ? null : _gslbProviders.get(0);// may return null;
> }
> {code}
> Caller GlobalLoadBalancingRulesServiceImpl#checkGslbServiceEnabledInZone have _!=null_:
> {code:java}
> private boolean checkGslbServiceEnabledInZone(long zoneId, long physicalNetworkId) {
>    GslbServiceProvider gslbProvider = lookupGslbServiceProvider();
>    if (gslbProvider == null) {
>       throw new CloudRuntimeException("No GSLB provider is available");
>    }
>    return gslbProvider.isServiceEnabledInZone(zoneId, physicalNetworkId);
> }
> {code}
> but another GlobalLoadBalancingRulesServiceImpl#applyGlobalLoadBalancerRuleConfig does not have !=null check:
> {code:java}
> GslbServiceProvider gslbProvider = lookupGslbServiceProvider();
> siteLb.setGslbProviderPublicIp(gslbProvider.getZoneGslbProviderPublicIp(dataCenterId,physicalNetworkId));
> .........{code}
> So we will add below code in non-(!=null) caller GlobalLoadBalancingRulesServiceImpl#applyGlobalLoadBalancerRuleConfig
> {code:java}
> if (gslbProvider == null) {
>     throw new CloudRuntimeException("No GSLB provider is available");
> }
> {code}
> But due to we are not very  familiar with CLOUDSTACK, hope some expert can review it.
> Thanks!!!!



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