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https://issues.apache.org/jira/browse/HADOOP-17686?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17342353#comment-17342353
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Viraj Jasani commented on HADOOP-17686:
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[~aajisaka] Would you like to take a look? It's a small fix. Thanks
> Potential NPE in org.apache.hadoop.fs.obs
> -----------------------------------------
>
> Key: HADOOP-17686
> URL: https://issues.apache.org/jira/browse/HADOOP-17686
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs
> Reporter: Error Reporter
> Assignee: Viraj Jasani
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h
> Remaining Estimate: 0h
>
> Hello,
> Our code analyses found a following potential NPE:
>
> {code:java}
> public Path getParent() {
> String path = uri.getPath();
> int lastSlash = path.lastIndexOf('/');
> int start = startPositionWithoutWindowsDrive(path);
> if ((path.length() == start) || // empty path
> (lastSlash == start && path.length() == start+1)) { // at root
> return null; <--- Null returned
> }
> {code}
>
> {code:java}
> private static void getDirectories(final String key, final String sourceKey,
> final Set<String> directories) {
> Path p = new Path(key);
> Path sourcePath = new Path(sourceKey);
> // directory must add first
> if (key.endsWith("/") && p.compareTo(sourcePath) > 0) {
> directories.add(p.toString());
> }
> while (p.compareTo(sourcePath) > 0) {
> p = p.getParent(); <--- NPE
> if (p.isRoot() || p.compareTo(sourcePath) == 0) {
> break;
> }
> {code}
> Given a root path, it will lead to NPE at method getDirectories
>
> Full trace:
>
> 1. Return null to caller
> [https://github.com/apache/hadoop/blob/f40e3eb0590f85bb42d2471992bf5d524628fdd6/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/Path.java#L432]
> 2. Function getParent executes and returns
> [https://github.com/apache/hadoop/blob/f40e3eb0590f85bb42d2471992bf5d524628fdd6/hadoop-cloud-storage-project/hadoop-huaweicloud/src/main/java/org/apache/hadoop/fs/obs/OBSObjectBucketUtils.java#L875]
> 3. The return value of function getParent is passed as the this pointer to
> function isRoot (the return value of function getParent can be null)
> [https://github.com/apache/hadoop/blob/f40e3eb0590f85bb42d2471992bf5d524628fdd6/hadoop-cloud-storage-project/hadoop-huaweicloud/src/main/java/org/apache/hadoop/fs/obs/OBSObjectBucketUtils.java#L876]
> Commit: f40e3eb0590f85bb42d2471992bf5d524628fdd6
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