[wasm] Bound the allowed number of locals.

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

Index: test/unittests/wasm/ast-decoder-unittest.cc
diff --git a/test/unittests/wasm/ast-decoder-unittest.cc b/test/unittests/wasm/ast-decoder-unittest.cc
index 7311f063a0ad8984ab47808cd8120ecb8dd8decb..83e78107832647e10942ccc15e0f5854bd6999c7 100644
--- a/test/unittests/wasm/ast-decoder-unittest.cc
+++ b/test/unittests/wasm/ast-decoder-unittest.cc
@@ -238,6 +238,11 @@ TEST_F(AstDecoderTest, GetLocal0_local) {
   EXPECT_VERIFIES(sigs.i_v(), kCodeGetLocal0);
 }
 
+TEST_F(AstDecoderTest, TooManyLocals) {
+  AddLocals(kAstI32, 4034986500);
+  EXPECT_FAILURE(sigs.i_v(), kCodeGetLocal0);
+}
+
 TEST_F(AstDecoderTest, GetLocal0_param_n) {
   FunctionSig* array[] = {sigs.i_i(), sigs.i_ii(), sigs.i_iii()};