Fixes the following security issue:
- CVE-2021-3177: Python 3.x through 3.9.1 has a buffer overflow in
PyCArg_repr in _ctypes/callproc.c, which may lead to remote code execution
in certain Python applications that accept floating-point numbers as
untrusted input, as demonstrated by a 1e300 argument to
c_double.from_param. This occurs because sprintf is used unsafely.
For details, see the advisory:
https://python-security.readthedocs.io/vuln/ctypes-buffer-overflow-pycarg_repr.html
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
