[wasm] Validate the length of strings before validating the string.

test/unittests/wasm/module-decoder-unittest.cc

Index: test/unittests/wasm/module-decoder-unittest.cc
diff --git a/test/unittests/wasm/module-decoder-unittest.cc b/test/unittests/wasm/module-decoder-unittest.cc
index 03aa57c71ef368e7eda8f3fa71d01042c2f5536e..6716ed766ab45222b8b5e083c9b070bee255e4e9 100644
--- a/test/unittests/wasm/module-decoder-unittest.cc
+++ b/test/unittests/wasm/module-decoder-unittest.cc
@@ -1023,6 +1023,20 @@ TEST_F(WasmModuleVerifyTest, ExportTableOne) {
   if (result.val) delete result.val;
 }
 
+TEST_F(WasmModuleVerifyTest, ExportNameWithInvalidStringLength) {
+  static const byte data[] = {// signatures
+                              SIGNATURES_SECTION_VOID_VOID,
+                              ONE_EMPTY_FUNCTION,
+                              SECTION(EXPORT_TABLE, 12),
+                              1,                // exports
+                              FUNC_INDEX(0),    // --
+                              NAME_LENGTH(84),  // invalid string length
+                              'e',              // --
+                              ONE_EMPTY_BODY};
+
+  EXPECT_FAILURE(data);
+}
+
 TEST_F(WasmModuleVerifyTest, ExportTableTwo) {
   static const byte data[] = {// signatures
                               SIGNATURES_SECTION_VOID_VOID,