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gh-118272: set stacktop to 0 before freeing contents, to avoid access to invalid objects during GC (#118478)

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Irit Katriel 2024-05-01 21:51:40 +01:00 • committed by GitHub
parent 1161ab9085
commit 6763bfcc0f
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1 changed files with 3 additions and 2 deletions
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5
Python/frame.c
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@ -98,10 +98,11 @@ void
_PyFrame_ClearLocals(_PyInterpreterFrame *frame)
{
assert(frame->stacktop >= 0);
for (int i = 0; i < frame->stacktop; i++) {
int stacktop = frame->stacktop;
frame->stacktop = 0;
for (int i = 0; i < stacktop; i++) {
Py_XDECREF(frame->localsplus[i]);
}
frame->stacktop = 0;
Py_CLEAR(frame->f_locals);
}