From 57c44958bfc5b153bcda820589a5c7b7d4c93301 Mon Sep 17 00:00:00 2001
From: Austin Wise <AustinWise@gmail.com>
Date: Fri, 22 Jul 2016 15:53:09 -0700
Subject: [PATCH] Validate the PDB type. This fixes #723. This duplicates the
 logic from jbevain/cecil#279

---
 ILSpy/LoadedAssembly.cs | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/ILSpy/LoadedAssembly.cs b/ILSpy/LoadedAssembly.cs
index f9cc50ad1..e83e96b72 100644
--- a/ILSpy/LoadedAssembly.cs
+++ b/ILSpy/LoadedAssembly.cs
@@ -139,6 +139,20 @@ namespace ICSharpCode.ILSpy
 		
 		private void LoadSymbols(ModuleDefinition module)
 		{
+			if (!module.HasDebugHeader) {
+				return;
+			}
+			byte[] headerBytes;
+			var debugHeader = module.GetDebugHeader(out headerBytes);
+			if (debugHeader.Type != 2) {
+				// the debug type is not IMAGE_DEBUG_TYPE_CODEVIEW
+				return;
+			}
+			if (debugHeader.MajorVersion != 0 || debugHeader.MinorVersion != 0) {
+				// the PDB type is not compatible with PdbReaderProvider. It is probably a Portable PDB
+				return;
+			}
+
 			// search for pdb in same directory as dll
 			string pdbName = Path.Combine(Path.GetDirectoryName(fileName), Path.GetFileNameWithoutExtension(fileName) + ".pdb");
 			if (File.Exists(pdbName)) {