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From "runlinzhang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-11764) NPE when the GroupMappingServiceProvider has no group
Date Mon, 08 May 2017 05:23:04 GMT

     [ https://issues.apache.org/jira/browse/HDFS-11764?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

runlinzhang updated HDFS-11764:
-------------------------------
    Attachment: image.png

> NPE when the GroupMappingServiceProvider has no group 
> ------------------------------------------------------
>
>                 Key: HDFS-11764
>                 URL: https://issues.apache.org/jira/browse/HDFS-11764
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 2.7.2
>            Reporter: runlinzhang
>            Priority: Critical
>             Fix For: 2.7.2
>
>         Attachments: image.png
>
>
> The following code can throw NPE if GroupMappingServiceProvider.getGroups() returns null.
> public List<String> load(String user) throws Exception {
>       List<String> groups = fetchGroupList(user);
>       if (groups.isEmpty()) {
>         if (isNegativeCacheEnabled()) {
>           negativeCache.add(user);
>         }
>         // We throw here to prevent Cache from retaining an empty group
>         throw noGroupsForUser(user);
>       }
>       return groups;
>     }
> eg:image



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