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| -rw-r--r-- | Misc/NEWS.d/next/Library/2021-10-07-14-04-10.bpo-45262.HqF71Z.rst | 1 | ||||
| -rw-r--r-- | Modules/_asynciomodule.c | 3 |
2 files changed, 4 insertions, 0 deletions
diff --git a/Misc/NEWS.d/next/Library/2021-10-07-14-04-10.bpo-45262.HqF71Z.rst b/Misc/NEWS.d/next/Library/2021-10-07-14-04-10.bpo-45262.HqF71Z.rst new file mode 100644 index 0000000000..4cd949fe1e --- /dev/null +++ b/Misc/NEWS.d/next/Library/2021-10-07-14-04-10.bpo-45262.HqF71Z.rst @@ -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
\ No newline at end of file diff --git a/Modules/_asynciomodule.c b/Modules/_asynciomodule.c index b615c48c43..4457d7bd49 100644 --- a/Modules/_asynciomodule.c +++ b/Modules/_asynciomodule.c @@ -3258,6 +3258,9 @@ 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); } |