Check that Dart_CreateIsolate is given a correct kind of snapshot.

runtime/vm/dart.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/dart.h"
 
 #include "vm/become.h"
 #include "vm/clustered_snapshot.h"
 #include "vm/code_observers.h"
 #include "vm/cpu.h"
@@ skipping 512 matching lines @@
     // Read the snapshot and setup the initial state.
     NOT_IN_PRODUCT(TimelineDurationScope tds(T,
         Timeline::GetIsolateStream(), "IsolateSnapshotReader"));
     // TODO(turnidge): Remove once length is not part of the snapshot.
     const Snapshot* snapshot = Snapshot::SetupFromBuffer(snapshot_buffer);
     if (snapshot == NULL) {
       const String& message = String::Handle(
           String::New("Invalid snapshot"));
       return ApiError::New(message);
     }
+    if (snapshot->kind() != snapshot_kind_) {
+      const String& message = String::Handle(
+          String::NewFormatted("Invalid snapshot kind: got '%s', expected '%s'",
+                               Snapshot::KindToCString(snapshot->kind()),
+                               Snapshot::KindToCString(snapshot_kind_)));
+      return ApiError::New(message);
+    }
     ASSERT(Snapshot::IsFull(snapshot->kind()));
-    ASSERT(snapshot->kind() == snapshot_kind_);
     if (FLAG_trace_isolates) {
       OS::Print("Size of isolate snapshot = %" Pd "\n", snapshot->length());
     }
     IsolateSnapshotReader reader(snapshot->kind(),
                                  snapshot->content(),
                                  snapshot->length(),
                                  Dart::instructions_snapshot_buffer(),
                                  Dart::data_snapshot_buffer(),
                                  T);
     const Error& error = Error::Handle(reader.ReadFullSnapshot());
@@ skipping 184 matching lines @@
   return predefined_handles_->handles_.IsValidScopedHandle(address);
 }
 
 
 bool Dart::IsReadOnlyApiHandle(Dart_Handle handle) {
   ASSERT(predefined_handles_ != NULL);
   return predefined_handles_->api_handles_.IsValidHandle(handle);
 }
 
 }  // namespace dart