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GH-96187: Prevent _PyCode_GetExtra to return garbage for negative indexes (GH-96188)

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Pablo Galindo Salgado 2022-08-23 11:13:53 +01:00 • committed by GitHub
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Misc/NEWS.d/next/Core and Builtins/2022-08-22-21-33-28.gh-issue-96187.W_6SRG.rst Normal file
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@ -0,0 +1,2 @@
Fixed a bug that caused ``_PyCode_GetExtra`` to return garbage for negative
indexes. Patch by Pablo Galindo

2
Objects/codeobject.c
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@ -1339,7 +1339,7 @@ _PyCode_GetExtra(PyObject *code, Py_ssize_t index, void **extra)
PyCodeObject *o = (PyCodeObject*) code;
_PyCodeObjectExtra *co_extra = (_PyCodeObjectExtra*) o->co_extra;
if (co_extra == NULL || co_extra->ce_size <= index) {
if (co_extra == NULL || index < 0 || co_extra->ce_size <= index) {
*extra = NULL;
return 0;
}