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[3.12] gh-126594: Fix typeobject.c wrap_buffer() cast (GH-126754) (#127005)

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gh-126594: Fix typeobject.c wrap_buffer() cast (GH-126754)

Reject flags smaller than INT_MIN.

(cherry picked from commit 84f07c3a4c)

Co-authored-by: Victor Stinner <vstinner@python.org>
Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
This commit is contained in:
Miss Islington (bot) 2024-11-19 09:33:18 +01:00 • committed by GitHub
parent 126acc1bb0
commit 9345dc165c
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2 changed files with 18 additions and 3 deletions
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15
Lib/test/test_buffer.py
View file

@ -4442,6 +4442,21 @@ class TestBufferProtocol(unittest.TestCase):
self.assertEqual(_testcapi.PyBuffer_SizeFromFormat(format),
struct.calcsize(format))
@support.cpython_only
def test_flags_overflow(self):
# gh-126594: Check for integer overlow on large flags
try:
from _testcapi import INT_MIN, INT_MAX
except ImportError:
INT_MIN = -(2 ** 31)
INT_MAX = 2 ** 31 - 1
obj = b'abc'
for flags in (INT_MIN - 1, INT_MAX + 1):
with self.subTest(flags=flags):
with self.assertRaises(OverflowError):
obj.__buffer__(flags)
class TestPythonBufferProtocol(unittest.TestCase):
def test_basic(self):

6
Objects/typeobject.c
View file

@ -8207,13 +8207,13 @@ wrap_buffer(PyObject *self, PyObject *args, void *wrapped)
if (flags == -1 && PyErr_Occurred()) {
return NULL;
}
if (flags > INT_MAX) {
if (flags > INT_MAX || flags < INT_MIN) {
PyErr_SetString(PyExc_OverflowError,
"buffer flags too large");
"buffer flags out of range");
return NULL;
}
return _PyMemoryView_FromBufferProc(self, Py_SAFE_DOWNCAST(flags, Py_ssize_t, int),
return _PyMemoryView_FromBufferProc(self, (int)flags,
(getbufferproc)wrapped);
}