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From "James Clampffer (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-10527) libhdfs++: hdfsGetBlockLocations doesn't null terminate ip address strings
Date Tue, 14 Jun 2016 21:16:30 GMT

     [ https://issues.apache.org/jira/browse/HDFS-10527?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

James Clampffer updated HDFS-10527:
-----------------------------------
    Status: Patch Available  (was: Open)

> libhdfs++: hdfsGetBlockLocations doesn't null terminate ip address strings
> --------------------------------------------------------------------------
>
>                 Key: HDFS-10527
>                 URL: https://issues.apache.org/jira/browse/HDFS-10527
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs-client
>            Reporter: James Clampffer
>            Assignee: James Clampffer
>         Attachments: HDFS-10527.HDFS-8707.000.patch
>
>
> Code looks like this
> {code}
> strncpy(buf, ipaddr.c_str(),ipaddr.size());
> {code}
> But should be
> {code}
> strncpy(buf, ipaddr.c_str(),ipaddr.size()+1);
> {code}
> In order to make sure there is at least 1 null terminating byte.  If we could run the
minidfscluster an another process and run valgrind on the libhdfs++ tests this would show
up really quickly as a sequence of invalid reads when that const char* was passed to std::string::string(const
char*), strlen, or strcpy.



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