Issue #7561: Operations on empty bytearrays (such as `int(bytearray())`)

could crash in many places because of the PyByteArray_AS_STRING() macro
returning NULL.  The macro now returns a statically allocated empty
string instead.

1 files changed, 7 insertions, 0 deletions

diff --git a/Lib/test/test_bytes.py b/Lib/test/test_bytes.py
index f2c9aa3..666894f 100644
--- a/Lib/test/test_bytes.py
+++ b/Lib/test/test_bytes.py
@@ -783,6 +783,13 @@ class ByteArrayTest(BaseBytesTest):
         self.assertRaises(BufferError, delslice)
         self.assertEquals(b, orig)
 
+    def test_empty_bytearray(self):
+        # Issue #7561: operations on empty bytearrays could crash in many
+        # situations, due to a fragile implementation of the
+        # PyByteArray_AS_STRING() C macro.
+        self.assertRaises(ValueError, int, bytearray(b''))
+
+
 class AssortedBytesTest(unittest.TestCase):
     #
     # Test various combinations of bytes and bytearray