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| author | Dominik Stadler <centic@apache.org> | 2023-08-09 07:23:04 +0000 |
|---|---|---|
| committer | Dominik Stadler <centic@apache.org> | 2023-08-09 07:23:04 +0000 |
| commit | fdeae16b0c617400d53266e36fc6123e59bbaed0 (patch) | |
| tree | 5e9460353ba067edb7165b1c075fa5022c718907 /poi-scratchpad | |
| parent | e25c467209a17891bcf1c8bb9a706c1c67d79544 (diff) | |
| download | poi-fdeae16b0c617400d53266e36fc6123e59bbaed0.tar.gz poi-fdeae16b0c617400d53266e36fc6123e59bbaed0.zip | |
Bug 66425: Avoid a ClassCastException found via oss-fuzz
We try to avoid throwing ClassCastException, but it was possible
to trigger one here with a specially crafted input-file
Should fix https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=61317
git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1911565 13f79535-47bb-0310-9956-ffa450edef68
Diffstat (limited to 'poi-scratchpad')
3 files changed, 9 insertions, 4 deletions
diff --git a/poi-scratchpad/src/main/java/org/apache/poi/hwpf/HWPFDocumentCore.java b/poi-scratchpad/src/main/java/org/apache/poi/hwpf/HWPFDocumentCore.java index 325abc6df8..22bf28eab7 100644 --- a/poi-scratchpad/src/main/java/org/apache/poi/hwpf/HWPFDocumentCore.java +++ b/poi-scratchpad/src/main/java/org/apache/poi/hwpf/HWPFDocumentCore.java @@ -54,7 +54,6 @@ import org.apache.poi.util.IOUtils; import org.apache.poi.util.Internal; import org.apache.poi.util.LittleEndianByteArrayInputStream; - /** * This class holds much of the core of a Word document, but * without some of the table structure information. @@ -187,7 +186,11 @@ public abstract class HWPFDocumentCore extends POIDocument { DirectoryEntry objectPoolEntry = null; if (directory.hasEntry(STREAM_OBJECT_POOL)) { - objectPoolEntry = (DirectoryEntry) directory.getEntry(STREAM_OBJECT_POOL); + final Entry entry = directory.getEntry(STREAM_OBJECT_POOL); + if (!(entry instanceof DirectoryEntry)) { + throw new IllegalArgumentException("Had unexpected type of entry for name: " + STREAM_OBJECT_POOL + ": " + entry.getClass()); + } + objectPoolEntry = (DirectoryEntry) entry; } _objectPool = new ObjectPoolImpl(objectPoolEntry); } diff --git a/poi-scratchpad/src/test/java/org/apache/poi/hwpf/converter/TestWordToConverterSuite.java b/poi-scratchpad/src/test/java/org/apache/poi/hwpf/converter/TestWordToConverterSuite.java index cafc6c3dfa..71f4327133 100644 --- a/poi-scratchpad/src/test/java/org/apache/poi/hwpf/converter/TestWordToConverterSuite.java +++ b/poi-scratchpad/src/test/java/org/apache/poi/hwpf/converter/TestWordToConverterSuite.java @@ -59,7 +59,8 @@ public class TestWordToConverterSuite "Fuzzed.doc", "clusterfuzz-testcase-minimized-POIHWPFFuzzer-5418937293340672.doc", "TestHPSFWritingFunctionality.doc", - "clusterfuzz-testcase-minimized-POIHWPFFuzzer-4947285593948160.doc" + "clusterfuzz-testcase-minimized-POIHWPFFuzzer-4947285593948160.doc", + "clusterfuzz-testcase-minimized-POIHWPFFuzzer-5440721166139392.doc" ); public static Stream<Arguments> files() { diff --git a/poi-scratchpad/src/test/java/org/apache/poi/hwpf/converter/TestWordToTextConverter.java b/poi-scratchpad/src/test/java/org/apache/poi/hwpf/converter/TestWordToTextConverter.java index 4bb810735f..30e46e5d9f 100644 --- a/poi-scratchpad/src/test/java/org/apache/poi/hwpf/converter/TestWordToTextConverter.java +++ b/poi-scratchpad/src/test/java/org/apache/poi/hwpf/converter/TestWordToTextConverter.java @@ -51,7 +51,8 @@ public class TestWordToTextConverter { // Corrupt files "clusterfuzz-testcase-minimized-POIHWPFFuzzer-5418937293340672.doc", "TestHPSFWritingFunctionality.doc", - "clusterfuzz-testcase-minimized-POIHWPFFuzzer-4947285593948160.doc" + "clusterfuzz-testcase-minimized-POIHWPFFuzzer-4947285593948160.doc", + "clusterfuzz-testcase-minimized-POIHWPFFuzzer-5440721166139392.doc" ); /** |