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gh-135302: Fix NULL pointer dereference in has_kwonlydefaults function #135303

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gh-135302: Fix NULL pointer dereference in has_kwonlydefaults function #135303

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3 changes: 3 additions & 0 deletions Python/symtable.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1780,6 +1780,9 @@ symtable_record_directive(struct symtable *st, identifier name, _Py_SourceLocati
static int
has_kwonlydefaults(asdl_arg_seq *kwonlyargs, asdl_expr_seq *kw_defaults)
{
if (!kw_defaults) {
return 0;
}
Comment on lines +1783 to +1785
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@picnixz picnixz Jun 9, 2025 •
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I think the loop won't be executed if we pass a NULL because s->v.AsyncFunctionDef.args->kwonlyargs would have a sequence length of 0 (for the existing calls). So I think we should add an assertion instead or leave the code as is.

for (int i = 0; i < asdl_seq_LEN(kwonlyargs); i++) {
expr_ty default_ = asdl_seq_GET(kw_defaults, i);
if (default_) {
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