gh-140301: Fix memory leak in subinterpreter `PyConfig` cleanup (#140303)

Co-authored-by: Kumar Aditya <kumaraditya@python.org>

diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2025-10-18-18-08-36.gh-issue-140301.m-2HxC.rst b/Misc/NEWS.d/next/Core_and_Builtins/2025-10-18-18-08-36.gh-issue-140301.m-2HxC.rst
new file mode 100644 (file)
index 0000000..8b1c81c
--- /dev/null
+++ b/Misc/NEWS.d/next/Core_and_Builtins/2025-10-18-18-08-36.gh-issue-140301.m-2HxC.rst
@@ -0,0 +1 @@
+Fix memory leak of ``PyConfig`` in subinterpreters.

diff --git a/Python/pystate.c b/Python/pystate.c
index af7828d6a030ab953a4ca92539556c2af81c8278..955457cdcf5c289c0651f5939b2f28630a9fb225 100644 (file)
--- a/Python/pystate.c
+++ b/Python/pystate.c
@@ -963,6 +963,8 @@ PyInterpreterState_Delete(PyInterpreterState *interp)
 
     _PyObject_FiniState(interp);
 
+    PyConfig_Clear(&interp->config);
+
     free_interpreter(interp);
 }