[TIKA-788] DWG parser infinite loop on possibly corrupt file

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.0
• Component/s: parser
• Assignee: Unassigned
• Reporter: Stas Shaposhnikov
• Created: 25/Nov/11 05:37
• Updated: 02/Mar/15 01:48

Description

When parsing some dwg items, it is possible that the parser may cause itself to go into an infinite loop.

Attached is the file causing the problem.

Here is a possible patch that will at least proceed until an error is thrown.

=== modified file 'tika-parsers/src/main/java/org/apache/tika/parser/dwg/DWGParser.java'
--- tika-parsers/src/main/java/org/apache/tika/parser/dwg/DWGParser.java        2011-11-24 11:30:33 +0000
+++ tika-parsers/src/main/java/org/apache/tika/parser/dwg/DWGParser.java        2011-11-25 05:27:41 +0000
@@ -274,8 +274,10 @@
             return false;
         }
         while (toSkip > 0) {
-            byte[] skip = new byte[Math.min((int) toSkip, 0x4000)];
-            IOUtils.readFully(stream, skip);
+            byte[] skip = new byte[(int) Math.min(toSkip, 0x4000)];
+            if (IOUtils.readFully(stream, skip) == -1) {
+               return false; //invalid skip
+            }
             toSkip -= skip.length;
         }
         return true;

Issue Links

• relates to: TIKA-1179 A corrupt mp3 file can cause an infinite loop in Mp3Parser