BUG: Add missing DECREF in Py2 int() cast

The Long number is downcast to int if possible, so the old version
has to be DECREF'ed.

Thanks to Johannes Barthelmes for bisecting the offending commit.

Closes gh-10474

1 files changed, 5 insertions, 1 deletions

diff --git a/numpy/core/src/umath/scalarmath.c.src b/numpy/core/src/umath/scalarmath.c.src
index 3b23151f1..7b424cc74 100644
--- a/numpy/core/src/umath/scalarmath.c.src
+++ b/numpy/core/src/umath/scalarmath.c.src
@@ -1424,7 +1424,11 @@ static PyObject *
 
 #ifndef NPY_PY3K
     /* Invoke long.__int__ to try to downcast */
-    long_result = Py_TYPE(long_result)->tp_as_number->nb_int(long_result);
+    {
+        PyObject *before_downcast = long_result;
+        long_result = Py_TYPE(long_result)->tp_as_number->nb_int(long_result);
+        Py_DECREF(before_downcast);
+    }
 #endif
 
     return long_result;