[jboss-jira] [JBoss JIRA] (JGRP-1753) BlockingInputStream: reading beyond the array's capacity

[Bela Ban (JIRA)]

     [ https://issues.jboss.org/browse/JGRP-1753?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bela Ban resolved JGRP-1753.
----------------------------

    Resolution: Done

    
> BlockingInputStream: reading beyond the array's capacity
> --------------------------------------------------------
>
>                 Key: JGRP-1753
>                 URL: https://issues.jboss.org/browse/JGRP-1753
>             Project: JGroups
>          Issue Type: Bug
>            Reporter: Bela Ban
>            Assignee: Bela Ban
>             Fix For: 3.4.2, 3.5
>
>
> If a BlockingInputStream {{input}} has a capacity of 8000 and we're calling {{input.read(buf, 0, buf.length)}} on a user buffer of 10000 with 14000 bytes added to {{input}}, then the following can happen:
> * {{input}} reads the first 8000 bytes and copies them to the user's buffer
> * The write position for the user's buffer is now at 8000 and the max number of bytes to be added is 2000 bytes, even if we have another 6000 bytes !
> * Instead of adding another 2000 bytes, we add another 6000 bytes, leading to an ArrayIndexOutOfBoundsException
> SOLUTION: the length of the remaining bytes has to be min(available, remaining space in user's buffer).
> The unit test is {{BlockingInputStreamTest.testWritingBeyondLength()}}

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