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[3.10] bpo-46070: Fix asyncio initialisation guard (GH-30423) #30453

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Merged
merged 1 commit into from
Jan 7, 2022
Merged

[3.10] bpo-46070: Fix asyncio initialisation guard (GH-30423) #30453

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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2022-01-07-13-51-22.bpo-46070.-axLUW.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Fix possible segfault when importing the :mod:`asyncio` module from
different sub-interpreters in parallel. Patch by Erlend E. Aasland.
10 changes: 4 additions & 6 deletions Modules/_asynciomodule.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3309,17 +3309,14 @@ static int
module_init(void)
{
PyObject *module = NULL;
if (module_initialized) {
return 0;
}

asyncio_mod = PyImport_ImportModule("asyncio");
if (asyncio_mod == NULL) {
goto fail;
}
if (module_initialized != 0) {
return 0;
}
else {
module_initialized = 1;
}

current_tasks = PyDict_New();
if (current_tasks == NULL) {
Expand Down Expand Up @@ -3380,6 +3377,7 @@ module_init(void)
goto fail;
}

module_initialized = 1;
Py_DECREF(module);
return 0;

Expand Down