Bug 66425: Avoid exceptions found via poi-fuzz

Prevent a NullPointerException Fixes https://issues.oss-fuzz.com/issues/42537720 git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1923061 13f79535-47bb-0310-9956-ffa450edef68
apache · Jan 11, 2025 · 6befe2a · 6befe2a
1 parent 76617e9
commit 6befe2a
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diff --git a/poi-scratchpad/src/main/java/org/apache/poi/hwpf/converter/AbstractWordUtils.java b/poi-scratchpad/src/main/java/org/apache/poi/hwpf/converter/AbstractWordUtils.java
@@ -240,6 +240,11 @@ public static String getBulletText( NumberingState numberingState,
                     }
                 }
 
+                // ensure the format does not grow too large, number-format
+                // can be roman-numbers, where very large numbers would have
+                // very many "M" and thus may cause memory to overload
+                IOUtils.safelyAllocateCheck(num, MAX_BULLET_BUFFER_SIZE/10);
+
                 bulletBuffer.append( NumberFormatter.getNumber( num,
                         list.getNumberFormat( level ) ) );
             } else {

diff --git a/test-data/document/clusterfuzz-testcase-minimized-POIHWPFFuzzer-5195207308541952.doc b/test-data/document/clusterfuzz-testcase-minimized-POIHWPFFuzzer-5195207308541952.doc
diff --git a/test-data/spreadsheet/stress.xls b/test-data/spreadsheet/stress.xls