Fix possible itemsize overflows in usm_ndarray from-pointer constructors

dpctl/tensor/_usmarray.pyx

@@ -1777,8 +1777,10 @@ cdef api object UsmNDArray_MakeSimpleFromPtr(
     Returns:
         Created usm_ndarray instance
     """
-    cdef size_t itemsize = type_bytesize(typenum)
-    cdef size_t nbytes = itemsize * nelems
+    cdef int itemsize = type_bytesize(typenum)
+    if (itemsize < 1):
+        raise ValueError("dtype with typenum=" + str(typenum) + " is not supported.")
+    cdef size_t nbytes = (<size_t> itemsize) * nelems
     cdef c_dpmem._Memory mobj = c_dpmem._Memory.create_from_usm_pointer_size_qref(
         ptr, nbytes, QRef, memory_owner=owner
     )
@@ -1817,7 +1819,7 @@ cdef api object UsmNDArray_MakeFromPtr(
     Returns:
         Created usm_ndarray instance
     """
-    cdef size_t itemsize = type_bytesize(typenum)
+    cdef int itemsize = type_bytesize(typenum)
     cdef int err = 0
     cdef size_t nelems = 1
     cdef Py_ssize_t min_disp = 0
@@ -1830,6 +1832,8 @@ cdef api object UsmNDArray_MakeFromPtr(
     cdef object obj_shape
     cdef object obj_strides
 
+    if (itemsize < 1):
+        raise ValueError("dtype with typenum=" + str(typenum) + " is not supported.")
     if (nd < 0):
         raise ValueError("Dimensionality must be non-negative")
     if (ptr is NULL or QRef is NULL):
@@ -1881,7 +1885,7 @@ cdef api object UsmNDArray_MakeFromPtr(
         raise ValueError(
             "Given shape, strides and offset reference out-of-bound memory"
         )
-    nbytes = itemsize * (offset + max_disp + 1)
+    nbytes = (<size_t> itemsize) * (offset + max_disp + 1)
     mobj = c_dpmem._Memory.create_from_usm_pointer_size_qref(
         ptr, nbytes, QRef, memory_owner=owner
     )

dpctl/tests/test_usm_ndarray_ctor.py

@@ -963,6 +963,75 @@ def test_pyx_capi_make_general():
     assert zd_arr._pointer == mat._pointer
 
 
+def test_pyx_capi_make_fns_invalid_typenum():
+    q = get_queue_or_skip()
+    usm_ndarray = dpt.empty(tuple(), dtype="i4", sycl_queue=q)
+
+    make_simple_from_ptr = _pyx_capi_fnptr_to_callable(
+        usm_ndarray,
+        "UsmNDArray_MakeSimpleFromPtr",
+        b"PyObject *(size_t, int, DPCTLSyclUSMRef, "
+        b"DPCTLSyclQueueRef, PyObject *)",
+        fn_restype=ctypes.py_object,
+        fn_argtypes=(
+            ctypes.c_size_t,
+            ctypes.c_int,
+            ctypes.c_void_p,
+            ctypes.c_void_p,
+            ctypes.py_object,
+        ),
+    )
+
+    nelems = 10
+    dtype = dpt.int64
+    arr = dpt.arange(nelems, dtype=dtype, sycl_queue=q)
+
+    with pytest.raises(ValueError):
+        make_simple_from_ptr(
+            ctypes.c_size_t(nelems),
+            -1,
+            arr._pointer,
+            arr.sycl_queue.addressof_ref(),
+            arr,
+        )
+
+    make_from_ptr = _pyx_capi_fnptr_to_callable(
+        usm_ndarray,
+        "UsmNDArray_MakeFromPtr",
+        b"PyObject *(int, Py_ssize_t const *, int, Py_ssize_t const *, "
+        b"DPCTLSyclUSMRef, DPCTLSyclQueueRef, Py_ssize_t, PyObject *)",
+        fn_restype=ctypes.py_object,
+        fn_argtypes=(
+            ctypes.c_int,
+            ctypes.POINTER(ctypes.c_ssize_t),
+            ctypes.c_int,
+            ctypes.POINTER(ctypes.c_ssize_t),
+            ctypes.c_void_p,
+            ctypes.c_void_p,
+            ctypes.c_ssize_t,
+            ctypes.py_object,
+        ),
+    )
+    c_shape = (ctypes.c_ssize_t * 1)(
+        nelems,
+    )
+    c_strides = (ctypes.c_ssize_t * 1)(
+        1,
+    )
+    with pytest.raises(ValueError):
+        make_from_ptr(
+            ctypes.c_int(1),
+            c_shape,
+            -1,
+            c_strides,
+            arr._pointer,
+            arr.sycl_queue.addressof_ref(),
+            ctypes.c_ssize_t(0),
+            arr,
+        )
+    del arr
+
+
 def _pyx_capi_int(X, pyx_capi_name, caps_name=b"int", val_restype=ctypes.c_int):
     import sys