Ted Yu created HDFS-7606:
----------------------------

             Summary: Missing null check in INodeFile#getBlocks()
                 Key: HDFS-7606
                 URL: https://issues.apache.org/jira/browse/HDFS-7606
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: Ted Yu
            Priority: Minor


{code}
    BlockInfo[] snapshotBlocks = diff == null ? getBlocks() : diff.getBlocks();
    if(snapshotBlocks != null)
      return snapshotBlocks;
    // Blocks are not in the current snapshot
    // Find next snapshot with blocks present or return current file blocks
    snapshotBlocks = getDiffs().findLaterSnapshotBlocks(diff.getSnapshotId());
{code}
If diff is null and snapshotBlocks is null, NullPointerException would result 
from the call to diff.getSnapshotId().



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