From f8f694ad4e55aaf58a99ddfc91937baf367658a8 Mon Sep 17 00:00:00 2001
From: dev747368 <48332326+dev747368@users.noreply.github.com>
Date: Tue, 18 Jun 2019 11:01:18 -0400
Subject: [PATCH] GT-2939 closes #690: handle empty DWARF compilation units.

Pulled-from: FergoFrog <45412+fergofrog@users.noreply.github.com>
---
 .../app/util/bin/format/dwarf4/DWARFCompilationUnit.java | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/dwarf4/DWARFCompilationUnit.java b/Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/dwarf4/DWARFCompilationUnit.java
index 2ed1bfde12..0f15dba673 100644
--- a/Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/dwarf4/DWARFCompilationUnit.java
+++ b/Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/dwarf4/DWARFCompilationUnit.java
@@ -148,6 +148,7 @@ public class DWARFCompilationUnit {
 		else {
 			format = DWARF_32;
 		}
+
 		long endOffset = (debugInfoBR.getPointerIndex() + length);
 		short version = debugInfoBR.readNextShort();
 		long abbreviationOffset = DWARFUtil.readOffsetByDWARFformat(debugInfoBR, format);
@@ -158,6 +159,14 @@ public class DWARFCompilationUnit {
 			throw new DWARFException(
 				"Only DWARF version 2, 3, or 4 information is currently supported.");
 		}
+		if (firstDIEOffset > endOffset) {
+			throw new IOException("Invalid length " + (endOffset - startOffset) +
+				" for DWARF Compilation Unit at 0x" + Long.toHexString(startOffset));
+		}
+		else if (firstDIEOffset == endOffset) {
+			// silently skip this empty compunit
+			return null;
+		}
 
 		debugAbbrBR.setPointerIndex(abbreviationOffset);
 		Map<Integer, DWARFAbbreviation> abbrMap =