`_sre.compile` overwrites `TypeError` with `OverflowError`

[sobolevn]

Bug report

Reproduction:

>>> import _sre
>>> _sre.compile('', 0, ['abc'], 0,{}, ())
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
OverflowError: regular expression code size limit exceeded

It should be:

>>> import _sre
>>> _sre.compile('', 0, ['abc'], 0,{}, ())
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
TypeError: an integer is required

Because the third arg is code: object(subclass_of='&PyList_Type'), it is assumed to be integers inside.

Problematic lines:

cpython/Modules/_sre/sre.c

Lines 1510 to 1515 in def7ea5

	unsigned long value = PyLong_AsUnsignedLong(o);
	self->code[i] = (SRE_CODE) value;
	if ((unsigned long) self->code[i] != value){
	PyErr_SetString(PyExc_OverflowError,
	"regular expression code size limit exceeded");
	break;

They do not check for PyLong_AsUnsignedLong errors.
I have a PR ready :)

Linked PRs

• gh-110590: Fix _sre.compile error overwrite #110591
• [3.12] gh-110590: Fix a bug where _sre.compile would overwrite exceptions (GH-110591) #110613
• [3.11] gh-110590: Fix a bug where _sre.compile would overwrite exceptions (GH-110591) #110614