[wasm] Break a decoder loop if there is a failure.

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 3c235adf1b469e1077eb52dd56e817e8f444e381..28ec527fbe39701a16d97c3f608a321b6bfeeeb5 100644
--- a/test/unittests/wasm/module-decoder-unittest.cc
+++ b/test/unittests/wasm/module-decoder-unittest.cc
@@ -1160,6 +1160,15 @@ TEST_F(WasmModuleVerifyTest, FunctionSignatures_one) {
   EXPECT_VERIFIES(data);
 }
 
+TEST_F(WasmModuleVerifyTest, Regression_648070) {
+  static const byte data[] = {
+      SECTION(SIGNATURES, 1), 0,        // --
+      SECTION(FUNCTION_SIGNATURES, 5),  // --
+      U32V_5(3500228624)                // function count = 3500228624
+  };                                    // --
+  EXPECT_FAILURE(data);
+}
+
 TEST_F(WasmModuleVerifyTest, FunctionBodies_empty) {
   static const byte data[] = {
       EMPTY_SIGNATURES_SECTION,           // --