[PDFBOX-2187] ArrayIndexOutOfBoundsException in TIFFFaxDecoder

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.8.6, 1.8.7, 2.0.0
• Fix Version/s: 1.8.7, 2.0.0
• Component/s: Rendering
• Labels: CCITTFaxDecode ccitt
• Assignee: Tilman Hausherr
• Reporter: Tilman Hausherr
• Created: 04/Jul/14 16:42
• Updated: 19/Sep/14 14:40
• Resolved: 04/Jul/14 16:49

Description

I get ArrayIndexOutOfBoundsExceptions at two locations with several files from the digitalcorpora site:

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 16
        at org.apache.pdfbox.filter.ccitt.TIFFFaxDecoder.decodeT6(TIFFFaxDecoder
.java:1002)        at org.apache.pdfbox.filter.CCITTFaxFilter.decode(CCITTFaxFilter.java:95)
...

or

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException:1
       at org.apache.pdfbox.filter.ccitt.TIFFFaxDecoder.decodeT6(TIFFFaxDecoder.java:916)       at org.apache.pdfbox.filter.CCITTFaxFilter.decode(CCITTFaxFilter.java:95)

The fix, which is also used by others who use the same code and which solves both exceptions, is to increase w by one in this segment:

        this.prevChangingElems = new int[w];
        this.currChangingElems = new int[w];