[wasm] Read global names only if their name length is valid.

src/wasm/module-decoder.cc

Index: src/wasm/module-decoder.cc
diff --git a/src/wasm/module-decoder.cc b/src/wasm/module-decoder.cc
index 7ffa7b1e78bedb1fab0ff7edd0352605646406c4..09b52a45c5b32da638a3adbe0bf0d75869e700e2 100644
--- a/src/wasm/module-decoder.cc
+++ b/src/wasm/module-decoder.cc
@@ -461,7 +461,8 @@ class ModuleDecoder : public Decoder {
   // Decodes a single global entry inside a module starting at {pc_}.
   void DecodeGlobalInModule(WasmGlobal* global) {
     global->name_offset = consume_string(&global->name_length, false);
-    if (!unibrow::Utf8::Validate(start_ + global->name_offset,
+    if (ok() &&
+        !unibrow::Utf8::Validate(start_ + global->name_offset,
                                  global->name_length)) {
       error("global name is not valid utf8");
     }