[wasm] Indirect calls without function table cause validation errors.

src/wasm/ast-decoder.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/signature.h"
 
 #include "src/bit-vector.h"
 #include "src/flags.h"
 #include "src/handles.h"
 #include "src/zone/zone-containers.h"
@@ skipping 209 matching lines @@
   inline bool Complete(const byte* pc, CallIndirectOperand& operand) {
     ModuleEnv* m = module_;
     if (m && m->module && operand.index < m->module->signatures.size()) {
       operand.sig = m->module->signatures[operand.index];
       return true;
     }
     return false;
   }
 
   inline bool Validate(const byte* pc, CallIndirectOperand& operand) {
+    uint32_t table_index = 0;
+    if (!module_->IsValidTable(table_index)) {
+      error("function table has to exist to execute call_indirect");
+      return false;
+    }
     if (Complete(pc, operand)) {
       return true;
     }
     error(pc, pc + 1, "invalid signature index: #%u", operand.index);
     return false;
   }
 
   inline bool Validate(const byte* pc, BreakDepthOperand& operand,
                        ZoneVector<Control>& control) {
     if (operand.depth < control.size()) {
@@ skipping 1790 matching lines @@
 BitVector* AnalyzeLoopAssignmentForTesting(Zone* zone, size_t num_locals,
                                            const byte* start, const byte* end) {
   FunctionBody body = {nullptr, nullptr, nullptr, start, end};
   WasmFullDecoder decoder(zone, nullptr, body);
   return decoder.AnalyzeLoopAssignmentForTesting(start, num_locals);
 }
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8