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From "Jiangbei Fan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (XALANC-743) XalanOutputStream::transcode falls into infinite loop on 4 bytes unicode till out of memory
Date Fri, 19 Apr 2013 21:43:15 GMT
Jiangbei Fan created XALANC-743:

             Summary: XalanOutputStream::transcode falls into infinite loop on 4 bytes unicode
till out of memory
                 Key: XALANC-743
                 URL: https://issues.apache.org/jira/browse/XALANC-743
             Project: XalanC
          Issue Type: Bug
          Components: XalanC
    Affects Versions: 1.10
         Environment: Linux
            Reporter: Jiangbei Fan
            Assignee: Steven J. Hathaway

In some rare cases, XalanTransformer::transform would stuck or crash when the input/stylesheet
contains 4-byte unicode. And I traced down the root cause in XalanOutputStream::transcode

When the transcode buffer contains unicode of size 4 bytes, and the last XalanDOMChar in the
buffer is the first 2 bytes of a 4-byte unicode char. The XalanOutputStream::transcode will
fall into an infinite loop till it is out of memory. As XMLUTF8Transcoder.cpp in xerces will
not consume the last 2-bytes if it is part of 4 byte unicode. And transcode always loop until
all chars in the buffer is eaten. Specifically this will happen when the last XalanDOMChar
 in the input buffer is between 0xD800 and 0xDBFF.

I cannot find whether this issue has been reported before. This is version 1.10.  I do have
a fix to add a bool reference to the function, so that the caller can push the last 2 byte
back to the buffer if not consumed. But want to check it out before submit any fixes.

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