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GH-128563: Don't leave frame->lltrace uninitialized #129417

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Merged
merged 2 commits into from
Jan 29, 2025
Merged

GH-128563: Don't leave frame->lltrace uninitialized #129417

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4268031
Initialize frame->lltrace to zero
brandtbucher Jan 28, 2025
0910526
blurb add
brandtbucher Jan 28, 2025
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6 changes: 6 additions & 0 deletions Include/internal/pycore_frame.h
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Original file line number Diff line number Diff line change
Expand Up @@ -215,6 +215,9 @@ _PyFrame_Initialize(
frame->return_offset = 0;
frame->owner = FRAME_OWNED_BY_THREAD;
frame->visited = 0;
#ifdef Py_DEBUG
frame->lltrace = 0;
#endif

for (int i = null_locals_from; i < code->co_nlocalsplus; i++) {
frame->localsplus[i] = PyStackRef_NULL;
Expand Down Expand Up @@ -398,6 +401,9 @@ _PyFrame_PushTrampolineUnchecked(PyThreadState *tstate, PyCodeObject *code, int
#endif
frame->owner = FRAME_OWNED_BY_THREAD;
frame->visited = 0;
#ifdef Py_DEBUG
frame->lltrace = 0;
#endif
frame->return_offset = 0;

#ifdef Py_GIL_DISABLED
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2025-01-28-11-13-41.gh-issue-128563.xElppE.rst
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@@ -0,0 +1,2 @@
Fix an issue where the "lltrace" debug feature could have been incorrectly
enabled for some frames.
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