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https://issues.apache.org/jira/browse/HADOOP-4271?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12634528#action_12634528
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Raghu Angadi commented on HADOOP-4271:
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> Before the patch, the default of verifyChecksum in FSInputChecker is false.
This is a surprise. It should be true by default. You might have found another
serious bug! Let me confirm.
> Bug in FSInputChecker makes it possible to read from an invalid buffer
> ----------------------------------------------------------------------
>
> Key: HADOOP-4271
> URL: https://issues.apache.org/jira/browse/HADOOP-4271
> Project: Hadoop Core
> Issue Type: Bug
> Components: fs
> Affects Versions: 0.16.0
> Reporter: Ning Li
> Assignee: Ning Li
> Priority: Blocker
> Fix For: 0.18.2, 0.19.0, 0.20.0
>
> Attachments: .data_testFSInputChecker.crc, data_testFSInputChecker,
> hadoop-4271.patch, hadoop-4271.patch
>
>
> Bug in FSInputChecker makes it possible to read from an invalid buffer. The
> buffer in FSInputChecker becomes invalid when readChecksumChunk is used to
> read a chunk to a user buffer directly. Currently, it's not marked as invalid
> in this case and may be read subsequently.
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