Check GenerateGuidForType argument for null (#21851)

* Check GenerateGuidForType argument for null

* Also check for RuntimeType

1 files changed, 13 insertions, 1 deletions

diff --git a/src/System.Private.CoreLib/src/System/Runtime/InteropServices/Marshal.cs b/src/System.Private.CoreLib/src/System/Runtime/InteropServices/Marshal.cs
index ff9844e206..ed3d648586 100644
--- a/src/System.Private.CoreLib/src/System/Runtime/InteropServices/Marshal.cs
+++ b/src/System.Private.CoreLib/src/System/Runtime/InteropServices/Marshal.cs
@@ -1540,7 +1540,19 @@ namespace System.Runtime.InteropServices
         /// metadata then it is returned otherwise a stable guid is generated based
         /// on the fully qualified name of the type.
         /// </summary>
-        public static Guid GenerateGuidForType(Type type) => type.GUID;
+        public static Guid GenerateGuidForType(Type type)
+        {
+            if (type == null)
+            {
+                throw new ArgumentNullException(nameof(type));
+            }
+            if (!(type is RuntimeType))
+            {
+                throw new ArgumentException(SR.Argument_MustBeRuntimeType, nameof(type));
+            }
+
+            return type.GUID;
+        }
 
         /// <summary>
         /// This method generates a PROGID for the specified type. If the type has