From 0419f86d14eb23ee5a48ec3494c34a559103e71d Mon Sep 17 00:00:00 2001
From: Alon Zakai <azakai@google.com>
Date: Thu, 4 Dec 2025 09:03:35 -0800
Subject: [PATCH] fix

---
 src/wasm/wasm-binary.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/wasm/wasm-binary.cpp b/src/wasm/wasm-binary.cpp
index 3ebd5d8ecba..7f385f16eb2 100644
--- a/src/wasm/wasm-binary.cpp
+++ b/src/wasm/wasm-binary.cpp
@@ -4733,12 +4733,15 @@ void WasmBinaryReader::readExports() {
 
 Expression* WasmBinaryReader::readExpression() {
   assert(builder.empty());
-  while (input[pos] != BinaryConsts::End) {
+  while (more() && input[pos] != BinaryConsts::End) {
     auto inst = readInst();
     if (auto* err = inst.getErr()) {
       throwError(err->msg);
     }
   }
+  if (!more()) {
+    throwError("unexpected end of input");
+  }
   ++pos;
   auto expr = builder.build();
   if (auto* err = expr.getErr()) {