[HDFS-11764] NPE when the GroupMappingServiceProvider has no group

• Type: Bug
• Status: Open
• Priority: Critical
• Resolution: Unresolved
• Affects Version/s: 2.7.2
• Fix Version/s: 2.7.2
• Component/s: security
• Target Version/s: 2.7.2
• Flags: Patch
• Assignee: Unassigned
• Reporter: runlinzhang
• Created: 08/May/17 05:18
• Updated: 31/Jul/17 22:07

Description

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