gh-140301: Fix memory leak in subinterpreter PyConfig cleanup

ashm-dev · ashm-dev · commit 4adb87e5444b · 2025-10-18T18:09:10.000+03:00
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
@@ -0,0 +1 @@
+Fix memory leak in subinterpreter creation
diff --git a/Python/pylifecycle.c b/Python/pylifecycle.c
@@ -1960,6 +1960,8 @@ finalize_interp_delete(PyInterpreterState *interp)
        created GIL, which ensures that Py_Initialize / Py_FinalizeEx can be
        called multiple times. */
 
+    PyConfig_Clear(&interp->config);
+
     PyInterpreterState_Delete(interp);
 }
 
@@ -2505,6 +2507,7 @@ new_interpreter(PyThreadState **tstate_p,
     if (tstate != NULL) {
         Py_EndInterpreter(tstate);
     } else if (interp != NULL) {
+        PyConfig_Clear(&interp->config);
         PyInterpreterState_Delete(interp);
     }
     if (save_tstate != NULL) {

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	`+Fix memory leak in subinterpreter creation`
Original file line number	Diff line number	Diff line change
`@@ -1960,6 +1960,8 @@ finalize_interp_delete(PyInterpreterState *interp)`
`1960`	`1960`	`created GIL, which ensures that Py_Initialize / Py_FinalizeEx can be`
`1961`	`1961`	`called multiple times. */`
`1962`	`1962`
	`1963`	`+ PyConfig_Clear(&interp->config);`
	`1964`	`+`
`1963`	`1965`	`PyInterpreterState_Delete(interp);`
`1964`	`1966`	`}`
`1965`	`1967`
`@@ -2505,6 +2507,7 @@ new_interpreter(PyThreadState **tstate_p,`
`2505`	`2507`	`if (tstate != NULL) {`
`2506`	`2508`	`Py_EndInterpreter(tstate);`
`2507`	`2509`	`} else if (interp != NULL) {`
	`2510`	`+ PyConfig_Clear(&interp->config);`
`2508`	`2511`	`PyInterpreterState_Delete(interp);`
`2509`	`2512`	`}`
`2510`	`2513`	`if (save_tstate != NULL) {`