From 7f0d90a525b2da5f54859ae8dcccd0079ca9519f Mon Sep 17 00:00:00 2001
From: Dmitry Kurtaev <dmitry.kurtaev+github@gmail.com>
Date: Mon, 16 Mar 2020 15:49:37 +0300
Subject: [PATCH] Fix memory leak in Python custom dnn layers

---
 modules/dnn/misc/python/pyopencv_dnn.hpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/modules/dnn/misc/python/pyopencv_dnn.hpp b/modules/dnn/misc/python/pyopencv_dnn.hpp
index 69c14240c3..d729cd8b97 100644
--- a/modules/dnn/misc/python/pyopencv_dnn.hpp
+++ b/modules/dnn/misc/python/pyopencv_dnn.hpp
@@ -160,12 +160,13 @@ public:
         PyObject* args = pyopencv_from(inputs);
         PyObject* res = PyObject_CallMethodObjArgs(o, PyString_FromString("forward"), args, NULL);
         Py_DECREF(args);
-        PyGILState_Release(gstate);
         if (!res)
             CV_Error(Error::StsNotImplemented, "Failed to call \"forward\" method");
 
         std::vector<Mat> pyOutputs;
         CV_Assert(pyopencv_to(res, pyOutputs, ArgInfo("", 0)));
+        Py_DECREF(res);
+        PyGILState_Release(gstate);
 
         CV_Assert(pyOutputs.size() == outputs.size());
         for (size_t i = 0; i < outputs.size(); ++i)