Fix API check for length of external arrays.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index e8ab5a7bce22ad1ee7906dc14a7f9fe510327904..bb343b5be805cd5ba666cee1877bc7dd6fc37fc0 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -3404,7 +3404,7 @@ void v8::Object::SetIndexedPropertiesToPixelData(uint8_t* data, int length) {
   ON_BAILOUT(isolate, "v8::SetElementsToPixelData()", return);
   ENTER_V8(isolate);
   i::HandleScope scope(isolate);
-  if (!ApiCheck(length <= i::ExternalPixelArray::kMaxLength,
+  if (!ApiCheck(length >= 0 && length <= i::ExternalPixelArray::kMaxLength,
                 "v8::Object::SetIndexedPropertiesToPixelData()",
                 "length exceeds max acceptable value")) {
     return;
@@ -3460,7 +3460,7 @@ void v8::Object::SetIndexedPropertiesToExternalArrayData(
   ON_BAILOUT(isolate, "v8::SetIndexedPropertiesToExternalArrayData()", return);
   ENTER_V8(isolate);
   i::HandleScope scope(isolate);
-  if (!ApiCheck(length <= i::ExternalArray::kMaxLength,
+  if (!ApiCheck(length >= 0 && length <= i::ExternalArray::kMaxLength,
                 "v8::Object::SetIndexedPropertiesToExternalArrayData()",
                 "length exceeds max acceptable value")) {
     return;