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From "Tellier Benoit (JIRA)" <server-...@james.apache.org>
Subject [jira] [Created] (JAMES-2278) IMAP QRESYNC (RFC-5162) is buggy
Date Thu, 04 Jan 2018 07:21:00 GMT
Tellier Benoit created JAMES-2278:
-------------------------------------

             Summary: IMAP QRESYNC (RFC-5162) is buggy
                 Key: JAMES-2278
                 URL: https://issues.apache.org/jira/browse/JAMES-2278
             Project: James Server
          Issue Type: Bug
            Reporter: Tellier Benoit


As reported by lmilev on the gitter chat, passing known sequence sets to QRESYNC leads to
an error in the IMAP layer:


{code:java}
INFO | jvm 1 | 2018/01/03 12:25:15 | [imapserver-executor-17] ERROR org.apache.james.imap.processor.base.AbstractChainedProcessor
- Error while processing IMAP request
INFO | jvm 1 | 2018/01/03 12:25:15 | java.lang.IndexOutOfBoundsException: Index: 2, Size:
2
INFO | jvm 1 | 2018/01/03 12:25:15 | at java.util.ArrayList.rangeCheck(ArrayList.java:653)
INFO | jvm 1 | 2018/01/03 12:25:15 | at java.util.ArrayList.get(ArrayList.java:429)
INFO | jvm 1 | 2018/01/03 12:25:15 | at org.apache.james.imap.processor.AbstractSelectionProcessor.respond(AbstractSelectionProcessor.java:240)
INFO | jvm 1 | 2018/01/03 12:25:15 | at org.apache.james.imapserver.netty.ImapChannelUpstreamHandler.messageReceived(ImapChannelUpstreamHandler.java:194)
{code}

I tried to write a MPT test but it is not trivial as it depends on random values (UIDVALIDITY)
and non fixed values (MODSEQ). Moreover the code is messy, dirty and not explicit.

The incriminated lines seems to be:

```
if (knownUidsList.size() > index++) {
     int msnAsInt = msn.intValue();
     MessageUid knownUid = knownUidsList.get(index);
     // Complicated sequential stuff
}
```

As this little test shows it:

```
    @Test
    public void test() {
        int i = 0;
        System.out.println(i++);
        System.out.println(i++);
    }

// Will output
// 0
// 1
```

The index can clearly be out of range.

```
if (knownUidsList.size() > ++index) {
     int msnAsInt = msn.intValue();
     MessageUid knownUid = knownUidsList.get(index);
     // Complicated sequential stuff
}
```

Should fix the issue.

We should find a way to provide *at least* unit tests for that issue.



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