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bpo-45262: Prevent use-after-free in asyncio by HiassofT · Pull Request #28796 · python/cpython · GitHub

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bpo-45262: Prevent use-after-free in asyncio #28796

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Merged
vstinner merged 1 commit into from
Oct 7, 2021
Conversation 16 Commits 1 Checks 0 Files changed
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bpo-45262: Prevent use-after-free in asyncio #28796

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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2021-10-07-14-04-10.bpo-45262.HqF71Z.rst
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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 changes: 3 additions & 0 deletions Modules/_asynciomodule.c
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Expand Up @@ -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;
}
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Py_CLEAR(rl->rl_loop);
PyObject_Free(rl);
}
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