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[3.11] GH-96569: Avoid undefined behavior (#96616)

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Co-authored-by: Michael Droettboom <mdboom@gmail.com>
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Mark Shannon 2022-09-08 12:00:04 +01:00 • committed by GitHub
parent 3d6e6beb0d
commit e72f469e85
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3 changed files with 25 additions and 16 deletions
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16
Python/pystate.c
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@ -2178,16 +2178,16 @@ push_chunk(PyThreadState *tstate, int size)
_PyInterpreterFrame *
_PyThreadState_BumpFramePointerSlow(PyThreadState *tstate, size_t size)
{
assert(size < INT_MAX/sizeof(PyObject *));
PyObject **base = tstate->datastack_top;
PyObject **top = base + size;
if (top >= tstate->datastack_limit) {
base = push_chunk(tstate, (int)size);
if (_PyThreadState_HasStackSpace(tstate, size)) {
_PyInterpreterFrame *res = (_PyInterpreterFrame *)tstate->datastack_top;
tstate->datastack_top += size;
return res;
}
else {
tstate->datastack_top = top;
if (size > INT_MAX/2) {
PyErr_NoMemory();
return NULL;
}
return (_PyInterpreterFrame *)base;
return (_PyInterpreterFrame *)push_chunk(tstate, (int)size);
}
void