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[3.9] bpo-41175: Guard against a NULL pointer dereference within bytearrayobject (GH-21240) #21431

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Merged
miss-islington merged 1 commit into from
Jul 10, 2020
Merged

[3.9] bpo-41175: Guard against a NULL pointer dereference within bytearrayobject (GH-21240) #21431

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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Core and Builtins/2020-06-30-20-17-31.bpo-41175.acJoXB.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Guard against a NULL pointer dereference within bytearrayobject triggered by
the ``bytearray() + bytearray()`` operation.
4 changes: 3 additions & 1 deletion Objects/bytearrayobject.c
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Expand Up @@ -273,7 +273,9 @@ PyByteArray_Concat(PyObject *a, PyObject *b)

result = (PyByteArrayObject *) \
PyByteArray_FromStringAndSize(NULL, va.len + vb.len);
if (result != NULL) {
// result->ob_bytes is NULL if result is an empty string:
// if va.len + vb.len equals zero.
if (result != NULL && result->ob_bytes != NULL) {
memcpy(result->ob_bytes, va.buf, va.len);
memcpy(result->ob_bytes + va.len, vb.buf, vb.len);
}
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