Terminate on \0 in data passed to String::New()

src/heap.cc

Index: src/heap.cc
diff --git a/src/heap.cc b/src/heap.cc
index f88ebda53d117dfd5b283b513f7743824f1d408c..8a92c5b07633ab3ea16421ed4ad6065ac262b9cc 100644
--- a/src/heap.cc
+++ b/src/heap.cc
@@ -3348,9 +3348,12 @@ MaybeObject* Heap::AllocateStringFromAscii(Vector<const char> string,
 
   // Copy the characters into the new object.
   SeqAsciiString* string_result = SeqAsciiString::cast(result);
-  for (int i = 0; i < string.length(); i++) {
+  int i;
+  for (i = 0; i < string.length(); i++) {
     string_result->SeqAsciiStringSet(i, string[i]);
+    if (string[i] == '\0') break;
   }
+  string_result->set_length(i);
   return result;
 }
 
@@ -3378,11 +3381,14 @@ MaybeObject* Heap::AllocateStringFromUtf8Slow(Vector<const char> string,
   // Convert and copy the characters into the new object.
   String* string_result = String::cast(result);
   decoder->Reset(string.start(), string.length());
-  for (int i = 0; i < chars; i++) {
+  int i;
+  for (i = 0; i < chars; i++) {
     uc32 r = decoder->GetNext();
     if (r > kMaxSupportedChar) { r = unibrow::Utf8::kBadChar; }
     string_result->Set(i, r);
+    if (r == 0) break;
   }
+  string_result->set_length(i);
   return result;
 }