Possible null pointer dereference of variable args in _PyPegen_collect_call_seqs

[federicovalenso]

Crash report

What happened?

args can be NULL as a result of _Py_asdl_expr_seq_new, and then dereference happens.

Return value of _Py_asdl_expr_seq_new` is usually checked, for example here and in other places.

CPython versions tested on:

3.11

Operating systems tested on:

Linux

Output from running 'python -VV' on the command line:

No response

Linked PRs

• gh-126240: handle NULL returned by _Py_asdl_expr_seq_new #126241
• [3.13] gh-126240: handle NULL returned by _Py_asdl_expr_seq_new (GH-126241) #126243
• [3.12] gh-126240: handle NULL returned by _Py_asdl_expr_seq_new (GH-126241) #126245

[picnixz]

Thanks for this one! I'll hunt other missing NULL check in PyPegen at the same time.