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https://issues.apache.org/jira/browse/HADOOP-4271?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12634521#action_12634521
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Ning Li commented on HADOOP-4271:
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> You really don't need change ChecksumFileSystem at all. You don't need to
> test with verifyChecksum off I think. It will make the patch much simpler.
Before the patch, the default of verifyChecksum in FSInputChecker is false. I
made the change in order to test with verifyChecksum being true.
> 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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