nodejs
diff --git a/‎lib/internal/ffi/fast-api.js‎
Lines changed: 0 additions & 5 deletions b/‎lib/internal/ffi/fast-api.js‎
Lines changed: 0 additions & 5 deletions
diff --git a/‎test/ffi/fixture_library/ffi_test_library.c‎
Lines changed: 5 additions & 0 deletions b/‎test/ffi/fixture_library/ffi_test_library.c‎
Lines changed: 5 additions & 0 deletions
diff --git a/‎test/ffi/test-ffi-fast-buffer.js‎
Lines changed: 18 additions & 0 deletions b/‎test/ffi/test-ffi-fast-buffer.js‎
Lines changed: 18 additions & 0 deletions
@@ -148,9 +148,6 @@ function getStringConversionPointer(state, value, index) {
   const size = value.length * 3 + 1;
   const buffers = state.buffers[state.depth - 1];
   let entry = buffers[index];
-  if (entry !== undefined && entry.string === value) {
-    return entry.pointer;
-  }
   if (StringPrototypeIncludes(value, '\0')) {
     throwFFIArgError(`Argument ${index} must not contain null bytes`);
   }
@@ -160,15 +157,13 @@ function getStringConversionPointer(state, value, index) {
       __proto__: null,
       buffer,
       pointer: getRawPointer(buffer),
-      string: undefined,
     };
     buffers[index] = entry;
   }
 
   const buffer = entry.buffer;
   const written = buffer.write(value, 0, size - 1, 'utf8');
   buffer[written] = 0;
-  entry.string = value;
   return entry.pointer;
 }
 
 
@@ -108,6 +108,11 @@ FFI_EXPORT uint8_t string_equals_hello(const char* str) {
   return str && strcmp(str, "hello") == 0;
 }
 
+FFI_EXPORT uint8_t overwrite_string(char* str, int32_t value, uint64_t length) {
+  memset(str, value, (size_t)length);
+  return (uint8_t)str[0];
+}
+
 FFI_EXPORT char* string_concat(const char* a, const char* b) {
   if (!a || !b) {
     // NOLINTNEXTLINE (readability/null_usage)
 
@@ -96,6 +96,24 @@ test('fast FFI string buffers survive reentrant callbacks', {
   }
 });
 
+test('fast FFI refreshes cached temporary string buffers', () => {
+  const lib = new ffi.DynamicLibrary(libraryPath);
+  const overwriteString = lib.getFunction('overwrite_string', {
+    arguments: ['string', 'i32', 'u64'],
+    return: 'u8',
+  });
+
+  try {
+    const mutated = overwriteString('hello', 0x79, 1n);
+    assert.strictEqual(mutated, 0x79);
+
+    const refreshed = overwriteString('hello', 0x79, 0n);
+    assert.strictEqual(refreshed, 0x68);
+  } finally {
+    lib.close();
+  }
+});
+
 test('optimized buffer signatures preserve pointer-like conversions', () => {
   const lib = new ffi.DynamicLibrary(libraryPath);
   const asPointer = lib.getFunction('pointer_to_usize', {