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gh-145058: Add input validation to _PyImport_LazyImportModuleLevelObject #145068

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Merged
pablogsal merged 3 commits into from
Feb 21, 2026
+22 −0
Merged

gh-145058: Add input validation to _PyImport_LazyImportModuleLevelObject #145068

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e160e5c
Add input validation to `_PyImport_LazyImportModuleLevelObject`
StanFromIreland Feb 21, 2026
ea28d2b
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StanFromIreland Feb 21, 2026
5b01fb5
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StanFromIreland Feb 21, 2026
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Apply suggestions from code review 
Co-authored-by: Victor Stinner <[email protected]>
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@StanFromIreland @vstinner
StanFromIreland and vstinner authored Feb 21, 2026
commit ea28d2bc1a82e9b5732e00b2fa693cb3a319ed69
16 changes: 8 additions & 8 deletions Lib/test/test_import/test_lazy_imports.py
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Original file line number Diff line number Diff line change
Expand Up @@ -393,14 +393,14 @@ def test_dunder_lazy_import_used(self):
import test.test_import.data.lazy_imports.dunder_lazy_import_used
self.assertIn("test.test_import.data.lazy_imports.basic2", sys.modules)

def test_dunder_lazy_import_non_string_name(self):
"""__lazy_import__ should reject non-string name arguments."""
with self.assertRaises(TypeError):
__lazy_import__(b"")
with self.assertRaises(TypeError):
__lazy_import__(123)
with self.assertRaises(TypeError):
__lazy_import__(None)
def test_dunder_lazy_import_invalid_arguments(self):
"""__lazy_import__ should reject invalid arguments."""
for invalid_name in (b"", 123, None):
with self.assertRaises(TypeError):
__lazy_import__(invalid_name)

with self.assertRaises(ValueError):
__lazy_import__("sys", level=-1)

def test_dunder_lazy_import_builtins(self):
"""__lazy_import__ should use module's __builtins__ for __import__."""
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4 changes: 2 additions & 2 deletions Python/import.c
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Expand Up @@ -4473,8 +4473,8 @@ _PyImport_LazyImportModuleLevelObject(PyThreadState *tstate,
return NULL;
}
if (!PyUnicode_Check(name)) {
_PyErr_SetString(tstate, PyExc_TypeError,
"module name must be a string");
_PyErr_Format(tstate, PyExc_TypeError,
"module name must be a string, got %T", name);
return NULL;
}
if (level < 0) {
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