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Posted to commits@cassandra.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2018/04/19 13:56:00 UTC

[jira] [Commented] (CASSANDRA-14385) Fix Some Potential NPE

    [ https://issues.apache.org/jira/browse/CASSANDRA-14385?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16444075#comment-16444075 ] 

ASF GitHub Bot commented on CASSANDRA-14385:
--------------------------------------------

GitHub user brettKK opened a pull request:

    https://github.com/apache/cassandra/pull/219

    CASSANDRA-14385

    @LJ1043041006 found a potential NPE in cassandra
    ---
    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:
    
    Calle Schema#getView may return null:
    ```
    public ViewMetadata getView(String keyspaceName, String viewName)
    {
        assert keyspaceName != null;
        KeyspaceMetadata ksm = keyspaces.getNullable(keyspaceName);
        return (ksm == null) ? null : ksm.views.getNullable(viewName);//may return null
    }
    ```
    
     it have 4 callers, 3 of them have !=null check, like its caller MigrationManager#announceViewDrop have !=null check()
    ```
    public static void announceViewDrop(String ksName, String viewName, boolean announceLocally) throws ConfigurationException
    {
       ViewMetadata view = Schema.instance.getView(ksName, viewName);
        if (view == null)//null pointer checker
            throw new ConfigurationException(String.format("Cannot drop non existing materialized view '%s' in keyspace '%s'.", viewName,     ksName));
       KeyspaceMetadata ksm = Schema.instance.getKeyspaceMetadata(ksName);
    
       logger.info("Drop table '{}/{}'", view.keyspace, view.name);
       announce(SchemaKeyspace.makeDropViewMutation(ksm, view, FBUtilities.timestampMicros()), announceLocally);
    }
    ```
    but caller MigrationManager#announceMigration does not have 

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/brettKK/cassandra CASSANDRA-14385

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/cassandra/pull/219.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #219
    
----
commit 61b4ed4afbd80fbde24bef3cedb9e8d3b06f788c
Author: brettkk <10...@...>
Date:   2018-04-19T13:49:49Z

    fix CASSANDRA-14385

----


> Fix Some Potential NPE 
> -----------------------
>
>                 Key: CASSANDRA-14385
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14385
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: lujie
>            Priority: Major
>         Attachments: CA-14385_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:
> Calle Schema#getView may return null:
> {code:java}
> public ViewMetadata getView(String keyspaceName, String viewName)
> {
>     assert keyspaceName != null;
>     KeyspaceMetadata ksm = keyspaces.getNullable(keyspaceName);
>     return (ksm == null) ? null : ksm.views.getNullable(viewName);//may return null
> }
> {code}
>  it have 4 callers, 3 of them have !=null check, like its caller MigrationManager#announceViewDrop have !=null check()
> {code:java}
> public static void announceViewDrop(String ksName, String viewName, boolean announceLocally) throws ConfigurationException
> {
>    ViewMetadata view = Schema.instance.getView(ksName, viewName);
>     if (view == null)//null pointer checker
>         throw new ConfigurationException(String.format("Cannot drop non existing materialized view '%s' in keyspace '%s'.", viewName,     ksName));
>    KeyspaceMetadata ksm = Schema.instance.getKeyspaceMetadata(ksName);
>    logger.info("Drop table '{}/{}'", view.keyspace, view.name);
>    announce(SchemaKeyspace.makeDropViewMutation(ksm, view, FBUtilities.timestampMicros()), announceLocally);
> }
> {code}
> but caller MigrationManager#announceMigration does not have 
> We add !=null check based on MigrationManager#announceViewDrop:
> {code:java}
> if (current == null)
>     throw new InvalidRequestException("There is no materialized view in keyspace " + keyspace());
> {code}
> But due to we are not very  familiar with CASSANDRA, hope some expert can review it.
> Thanks!!!!
>  



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