@@ -722,8 +722,8 @@ MaybeLocal<Value> StringBytes::Encode(Isolate* isolate,
       }
       if (reinterpret_cast<uintptr_t>(buf) % 2 != 0) {
         return EncodeTwoByteString(
-            isolate, str_len, [buf, buflen](uint16_t* dst) {
-              memcpy(dst, buf, buflen);
+            isolate, str_len, [buf, str_len](uint16_t* dst) {
+              memcpy(dst, buf, str_len * sizeof(*dst));
             });
       }
       return ExternTwoByteString::NewFromCopy(
 
@@ -9,6 +9,13 @@ for (const encoding of ['utf8', 'utf-8', 'ucs2', 'ucs-2', 'ascii', 'latin1',
   assert.strictEqual(Buffer.from('foo', encoding).toString(encoding), 'foo');
 }
 
+// Ignore an incomplete trailing code unit when decoding unaligned UTF-16LE.
+for (const size of [514, 516]) {
+  const buffer = Buffer.alloc(size, 0x61);
+  assert.strictEqual(buffer.toString('utf16le', 1),
+                     '\u6161'.repeat((size - 1) >>> 1));
+}
+
 // base64
 ['base64', 'BASE64'].forEach((encoding) => {
   assert.strictEqual(Buffer.from('Zm9v', encoding).toString(encoding), 'Zm9v');
Original file line number	Diff line number	Diff line change
`@@ -722,8 +722,8 @@ MaybeLocal<Value> StringBytes::Encode(Isolate* isolate,`
`722`	`722`	`}`
`723`	`723`	`if (reinterpret_cast<uintptr_t>(buf) % 2 != 0) {`
`724`	`724`	`return EncodeTwoByteString(`
`725`		`- isolate, str_len, [buf, buflen](uint16_t* dst) {`
`726`		`- memcpy(dst, buf, buflen);`
	`725`	`+ isolate, str_len, [buf, str_len](uint16_t* dst) {`
	`726`	`+ memcpy(dst, buf, str_len * sizeof(*dst));`
`727`	`727`	`});`
`728`	`728`	`}`
`729`	`729`	`return ExternTwoByteString::NewFromCopy(`