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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4271) Bug in FSInputChecker makes it possible to read from an invalid buffer
Date Mon, 29 Sep 2008 21:18:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4271?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12635538#action_12635538
] 

Hairong Kuang commented on HADOOP-4271:
---------------------------------------

> 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.

I do not understand why this is a bug. Only when the buffer does not have any available byte,
data are read to the user buffer directly. So there is no need to invalidate the buffer.

> 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: 0.17.3, 0.18.2
>
>         Attachments: .data_testFSInputChecker.crc, data_testFSInputChecker, hadoop-4271-branch-17.patch,
hadoop-4271-branch-18.patch, hadoop-4271-branch-18.patch, hadoop-4271.patch, hadoop-4271.patch,
hadoop-4271.patch, hadoop-4271.patch, HADOOP-4277-branch-18-correction.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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