bpo-36946: Fix possible signed integer overflow when handling slices. (GH-13375)

The final addition (cur += step) may overflow, so use size_t for "cur".
"cur" is always positive (even for negative steps), so it is safe to use
size_t here.

Co-Authored-By: Martin Panter <vadmium+py@gmail.com>
diff --git a/Lib/test/seq_tests.py b/Lib/test/seq_tests.py
index 6aedd2b..65b110e 100644
--- a/Lib/test/seq_tests.py
+++ b/Lib/test/seq_tests.py
@@ -209,6 +209,7 @@
         a = self.type2test([0,1,2,3,4])
         self.assertEqual(a[ -pow(2,128): 3 ], self.type2test([0,1,2]))
         self.assertEqual(a[ 3: pow(2,145) ], self.type2test([3,4]))
+        self.assertEqual(a[3::sys.maxsize], self.type2test([3]))
 
     def test_contains(self):
         u = self.type2test([0, 1, 2])
diff --git a/Lib/test/string_tests.py b/Lib/test/string_tests.py
index 836a43b..38da941 100644
--- a/Lib/test/string_tests.py
+++ b/Lib/test/string_tests.py
@@ -1135,7 +1135,7 @@
     def test_extended_getslice(self):
         # Test extended slicing by comparing with list slicing.
         s = string.ascii_letters + string.digits
-        indices = (0, None, 1, 3, 41, -1, -2, -37)
+        indices = (0, None, 1, 3, 41, sys.maxsize, -1, -2, -37)
         for start in indices:
             for stop in indices:
                 # Skip step 0 (invalid)
diff --git a/Lib/test/test_array.py b/Lib/test/test_array.py
index 57c396d..c243957 100644
--- a/Lib/test/test_array.py
+++ b/Lib/test/test_array.py
@@ -746,7 +746,7 @@
         # Test extended slicing by comparing with list slicing
         # (Assumes list conversion works correctly, too)
         a = array.array(self.typecode, self.example)
-        indices = (0, None, 1, 3, 19, 100, -1, -2, -31, -100)
+        indices = (0, None, 1, 3, 19, 100, sys.maxsize, -1, -2, -31, -100)
         for start in indices:
             for stop in indices:
                 # Everything except the initial 0 (invalid step)
@@ -844,7 +844,7 @@
         self.assertRaises(TypeError, a.__setitem__, slice(0, 1), b)
 
     def test_extended_set_del_slice(self):
-        indices = (0, None, 1, 3, 19, 100, -1, -2, -31, -100)
+        indices = (0, None, 1, 3, 19, 100, sys.maxsize, -1, -2, -31, -100)
         for start in indices:
             for stop in indices:
                 # Everything except the initial 0 (invalid step)
diff --git a/Lib/test/test_bytes.py b/Lib/test/test_bytes.py
index a091360..9502a8f 100644
--- a/Lib/test/test_bytes.py
+++ b/Lib/test/test_bytes.py
@@ -285,7 +285,7 @@
         # Test extended slicing by comparing with list slicing.
         L = list(range(255))
         b = self.type2test(L)
-        indices = (0, None, 1, 3, 19, 100, -1, -2, -31, -100)
+        indices = (0, None, 1, 3, 19, 100, sys.maxsize, -1, -2, -31, -100)
         for start in indices:
             for stop in indices:
                 # Skip step 0 (invalid)
@@ -1242,7 +1242,8 @@
         self.assertLessEqual(sys.getsizeof(b), size)
 
     def test_extended_set_del_slice(self):
-        indices = (0, None, 1, 3, 19, 300, 1<<333, -1, -2, -31, -300)
+        indices = (0, None, 1, 3, 19, 300, 1<<333, sys.maxsize,
+            -1, -2, -31, -300)
         for start in indices:
             for stop in indices:
                 # Skip invalid step 0
diff --git a/Lib/test/test_mmap.py b/Lib/test/test_mmap.py
index dd857a0..495d24a 100644
--- a/Lib/test/test_mmap.py
+++ b/Lib/test/test_mmap.py
@@ -439,7 +439,7 @@
         m = mmap.mmap(-1, len(s))
         m[:] = s
         self.assertEqual(m[:], s)
-        indices = (0, None, 1, 3, 19, 300, -1, -2, -31, -300)
+        indices = (0, None, 1, 3, 19, 300, sys.maxsize, -1, -2, -31, -300)
         for start in indices:
             for stop in indices:
                 # Skip step 0 (invalid)
@@ -451,7 +451,7 @@
         # Test extended slicing by comparing with list slicing.
         s = bytes(reversed(range(256)))
         m = mmap.mmap(-1, len(s))
-        indices = (0, None, 1, 3, 19, 300, -1, -2, -31, -300)
+        indices = (0, None, 1, 3, 19, 300, sys.maxsize, -1, -2, -31, -300)
         for start in indices:
             for stop in indices:
                 # Skip invalid step 0