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gh-101975: Fixed a potential SegFault on garbage collection (GH-102803)

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gaogaotiantian 2023-03-18 03:59:21 -07:00 • committed by GitHub
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Misc/NEWS.d/next/Core and Builtins/2023-03-18-02-36-39.gh-issue-101975.HwMR1d.rst Normal file
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@ -0,0 +1 @@
Fixed ``stacktop`` value on tracing entries to avoid corruption on garbage collection.

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Python/ceval_macros.h
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@ -310,6 +310,7 @@ GETITEM(PyObject *v, Py_ssize_t i) {
_PyFrame_SetStackPointer(frame, stack_pointer); \ _PyFrame_SetStackPointer(frame, stack_pointer); \
int err = trace_function_entry(tstate, frame); \ int err = trace_function_entry(tstate, frame); \
stack_pointer = _PyFrame_GetStackPointer(frame); \ stack_pointer = _PyFrame_GetStackPointer(frame); \
frame->stacktop = -1; \
if (err) { \ if (err) { \
goto error; \ goto error; \
} \ } \