DWG parser infinite loop on possibly corrupt file
-------------------------------------------------
Key: TIKA-788
URL: https://issues.apache.org/jira/browse/TIKA-788
Project: Tika
Issue Type: Bug
Components: parser
Affects Versions: 1.0
Reporter: Stas Shaposhnikov
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;
--
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