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https://issues.apache.org/jira/browse/PDFBOX-5972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17933882#comment-17933882
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ASF subversion and git services commented on PDFBOX-5972:
---------------------------------------------------------
Commit 1924271 from Tilman Hausherr in branch 'pdfbox/trunk'
[ https://svn.apache.org/r1924271 ]
PDFBOX-5972: avoid infinite loop, as suggested by Michael Flester
> Infinite loop in fontbox o.a.f.cmap.CMapParser#readNumber
> ---------------------------------------------------------
>
> Key: PDFBOX-5972
> URL: https://issues.apache.org/jira/browse/PDFBOX-5972
> Project: PDFBox
> Issue Type: Bug
> Components: FontBox
> Affects Versions: 3.0.3 PDFBox, 3.0.4 PDFBox
> Reporter: Michael Flester
> Priority: Major
> Attachments: sample-decoded.pdf
>
>
> The sample document attached goes into an infinite loop in
> o.a.f.CMapParser.readNumber.
> The attached document was created from proprietary content by using
> o.a.p.tools.PDFSplit and o.a.p.tools.WriteDecodedDoc, so that we could remove
> the proprietary content more easily.
>
> The very short stream at line 225/226 happens to end with '6', and this makes
> the current readNumber routine rewind the EOF, and leaves it unable to
> progress.
>
> Here is a patch that seems to fix this issue by not rewinding EOF. All
> existing unit tests still pass with this patch (diff -w), and the sample
> document exhibits normal behavior.
> {noformat}
> --- a/fontbox/src/main/java/org/apache/fontbox/cmap/CMapParser.java
> +++ b/fontbox/src/main/java/org/apache/fontbox/cmap/CMapParser.java
> @@ -652,7 +652,10 @@ public class CMapParser
> buffer.append((char) nextByte);
> nextByte = randomAcccessRead.read();
> }
> + if (nextByte != -1)
> + {
> randomAcccessRead.rewind(1);
> + }
> String value = buffer.toString();
> try
> { {noformat}
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