Issue #13461: Fix a crash in the TextIOWrapper.tell method on 64-bit platforms.

Patch by Yogesh Chaudhari.

Misc/NEWS

@@ -66,6 +66,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #13461: Fix a crash in the TextIOWrapper.tell method on 64-bit
+  platforms.  Patch by Yogesh Chaudhari.
+
 - Issue #18777: The ssl module now uses the new CRYPTO_THREADID API of
   OpenSSL 1.0.0+ instead of the deprecated CRYPTO id callback function.
 

Modules/_io/textio.c

@@ -2370,7 +2370,7 @@ textiowrapper_tell(textio *self, PyObject *args)
     while (input < input_end) {
         Py_ssize_t n;
 
-        DECODER_DECODE(input, 1, n);
+        DECODER_DECODE(input, (Py_ssize_t)1, n);
         /* We got n chars for 1 byte */
         chars_decoded += n;
         cookie.bytes_to_feed += 1;