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bpo-45262, asyncio: Fix cache of the running loop holder (GH-28796) 

Prevent use-after-free of running loop holder via cache.
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Matthias Reichl 2021-10-08 00:46:49 +02:00 committed by GitHub
parent 0219017df7
commit 392a898353
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1
Misc/NEWS.d/next/Library/2021-10-07-14-04-10.bpo-45262.HqF71Z.rst Normal file
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@ -0,0 +1 @@
Prevent use-after-free in asyncio. Make sure the cached running loop holder gets cleared on dealloc to prevent use-after-free in get_running_loop

3
Modules/_asynciomodule.c
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@ -3239,6 +3239,9 @@ new_running_loop_holder(PyObject *loop)
static void
PyRunningLoopHolder_tp_dealloc(PyRunningLoopHolder *rl)
{
if (cached_running_holder == (PyObject *)rl) {
cached_running_holder = NULL;
}
Py_CLEAR(rl->rl_loop);
PyObject_Free(rl);
}