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https://issues.apache.org/jira/browse/XALANC-743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13644163#comment-13644163
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Steven J. Hathaway commented on XALANC-743:
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FYI.
The current version of Xalan-C (XSLT) is 1.11 and uses Xerces-C (XML
Parser) versions 3.0 or newer.
The distribution Xalan-C 1.11 is built using Xerces-C version 3.1.1.
The older Xalan-C (XSLT) version 1.10 was built using Xerces-C version 2.7.
The latest Xerces-C in the (2) series is version 2.8.
Sincerely,
Steven J. Hathaway
> 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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