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bpo-42854: Correctly use size_t for _ssl._SSLSocket.read and _ssl._SSLSocket.write #27271

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Jul 23, 2021
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
Fixed a bug in the :mod:`_ssl` module that was throwing :exc:`OverflowError`
when using :meth:`_ssl._SSLSocket.write` and :meth:`_ssl._SSLSocket.read`
for a big value of the ``len`` parameter. Patch by Pablo Galindo
12 changes: 6 additions & 6 deletions Modules/_ssl.c
Original file line number Diff line number Diff line change
Expand Up @@ -2346,7 +2346,7 @@ _ssl__SSLSocket_write_impl(PySSLSocket *self, Py_buffer *b)

do {
PySSL_BEGIN_ALLOW_THREADS
retval = SSL_write_ex(self->ssl, b->buf, (int)b->len, &count);
retval = SSL_write_ex(self->ssl, b->buf, (size_t)b->len, &count);
err = _PySSL_errno(retval == 0, self->ssl, retval);
PySSL_END_ALLOW_THREADS
self->err = err;
Expand Down Expand Up @@ -2418,7 +2418,7 @@ _ssl__SSLSocket_pending_impl(PySSLSocket *self)

/*[clinic input]
_ssl._SSLSocket.read
size as len: int
size as len: Py_ssize_t
[
buffer: Py_buffer(accept={rwbuffer})
]
Expand All @@ -2428,9 +2428,9 @@ Read up to size bytes from the SSL socket.
[clinic start generated code]*/

static PyObject *
_ssl__SSLSocket_read_impl(PySSLSocket *self, int len, int group_right_1,
Py_buffer *buffer)
/*[clinic end generated code: output=00097776cec2a0af input=ff157eb918d0905b]*/
_ssl__SSLSocket_read_impl(PySSLSocket *self, Py_ssize_t len,
int group_right_1, Py_buffer *buffer)
/*[clinic end generated code: output=49b16e6406023734 input=ec48bf622be1c4a1]*/
{
PyObject *dest = NULL;
char *mem;
Expand Down Expand Up @@ -2498,7 +2498,7 @@ _ssl__SSLSocket_read_impl(PySSLSocket *self, int len, int group_right_1,

do {
PySSL_BEGIN_ALLOW_THREADS
retval = SSL_read_ex(self->ssl, mem, len, &count);
retval = SSL_read_ex(self->ssl, mem, (size_t)len, &count);
err = _PySSL_errno(retval == 0, self->ssl, retval);
PySSL_END_ALLOW_THREADS
self->err = err;
Expand Down
12 changes: 6 additions & 6 deletions Modules/clinic/_ssl.c.h

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