bpo-32710: Fix leak in Overlapped_WSASend() (pythonGH-11469)

Fix a memory leak in asyncio in the ProactorEventLoop when ReadFile() or WSASend() overlapped operation fail immediately: release the internal buffer.
aib · Jan 8, 2019 · a234e14 · a234e14
1 parent 872bd2b
commit a234e14
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diff --git a/Misc/NEWS.d/next/Library/2019-01-08-14-00-52.bpo-32710.Sn5Ujj.rst b/Misc/NEWS.d/next/Library/2019-01-08-14-00-52.bpo-32710.Sn5Ujj.rst
@@ -0,0 +1,3 @@
+Fix a memory leak in asyncio in the ProactorEventLoop when ``ReadFile()`` or
+``WSASend()`` overlapped operation fail immediately: release the internal
+buffer.
diff --git a/Modules/overlapped.c b/Modules/overlapped.c
@@ -723,6 +723,7 @@ do_ReadFile(OverlappedObject *self, HANDLE handle,
         case ERROR_IO_PENDING:
             Py_RETURN_NONE;
         default:
+            PyBuffer_Release(&self->user_buffer);
             self->type = TYPE_NOT_STARTED;
             return SetFromWindowsErr(err);
     }
@@ -1011,6 +1012,7 @@ Overlapped_WSASend(OverlappedObject *self, PyObject *args)
         case ERROR_IO_PENDING:
             Py_RETURN_NONE;
         default:
+            PyBuffer_Release(&self->user_buffer);
             self->type = TYPE_NOT_STARTED;
             return SetFromWindowsErr(err);
     }