[3.7] bpo-40559: Add Py_DECREF to _asynciomodule.c:task_step_impl() (GH-19990)

This fixes a possible memory leak in the C implementation of
asyncio.Task.
(cherry picked from commit d2c349b190bcba21a4a38e6520a48ad97a9f1529)

Co-authored-by: Chris Jerdonek <chris.jerdonek@gmail.com>

diff --git a/Misc/NEWS.d/next/Library/2020-05-05-08-12-51.bpo-40559.112wwa.rst b/Misc/NEWS.d/next/Library/2020-05-05-08-12-51.bpo-40559.112wwa.rst
new file mode 100644 (file)
index 0000000..1584635
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2020-05-05-08-12-51.bpo-40559.112wwa.rst
@@ -0,0 +1 @@
+Fix possible memory leak in the C implementation of :class:`asyncio.Task`.
\ No newline at end of file

diff --git a/Modules/_asynciomodule.c b/Modules/_asynciomodule.c
index 441506bc82a14b394d26c51e3908fad85631d1fe..7880de327f63714e82c07fa5d82de3655c21a3f8 100644 (file)
--- a/Modules/_asynciomodule.c
+++ b/Modules/_asynciomodule.c
@@ -2567,6 +2567,10 @@ task_step_impl(TaskObj *task, PyObject *exc)
     coro = task->task_coro;
     if (coro == NULL) {
         PyErr_SetString(PyExc_RuntimeError, "uninitialized Task object");
+        if (clear_exc) {
+            /* We created 'exc' during this call */
+            Py_DECREF(exc);
+        }
         return NULL;
     }