6964170: Verifier crashes

Summary: Check if klassOop != NULL rather than klass_part != NULL
Reviewed-by: kamg, never

src/share/vm/classfile/verificationType.cpp

@@ -70,8 +70,10 @@ bool VerificationType::is_reference_assignable_from(
   } else if (is_array() && from.is_array()) {
     VerificationType comp_this = get_component(CHECK_false);
     VerificationType comp_from = from.get_component(CHECK_false);
+    if (!comp_this.is_bogus() && !comp_from.is_bogus()) {
       return comp_this.is_assignable_from(comp_from, context, CHECK_false);
     }
+  }
   return false;
 }
 
@@ -98,7 +100,7 @@ VerificationType VerificationType::get_component(TRAPS) const {
         CHECK_(VerificationType::bogus_type()));
       return VerificationType::reference_type(component);
     default:
-      ShouldNotReachHere();
+      // Met an invalid type signature, e.g. [X
       return VerificationType::bogus_type();
   }
 }

src/share/vm/classfile/verifier.cpp

@@ -1847,12 +1847,8 @@ void ClassVerifier::verify_invoke_init(
   if (type == VerificationType::uninitialized_this_type()) {
     // The method must be an <init> method of either this class, or one of its
     // superclasses
-    klassOop oop = current_class()();
-    Klass* klass = oop->klass_part();
-    while (klass != NULL && ref_class_type.name() != klass->name()) {
-      klass = klass->super()->klass_part();
-    }
-    if (klass == NULL) {
+    if (ref_class_type.name() != current_class()->name() &&
+        !name_in_supers(ref_class_type.name(), current_class())) {
       verify_error(bci, "Bad <init> method call");
       return;
     }