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# HG changeset patch
# User Benjamin Peterson <benjamin@python.org>
# Date 1389671978 18000
# Node ID 87673659d8f7ba1623cd4914f09ad3d2ade034e9
# Parent 2631d33ee7fbd5f0288931ef37872218d511d2e8
complain when nbytes > buflen to fix possible buffer overflow (closes #20246)
# HG changeset patch
# User Stefan Krah <skrah@bytereef.org>
# Date 1390341952 -3600
# Node ID b6c5a37b221f5c617125faa363d1b460b0b61b42
# Parent d55d1cbf5f9a9efa7908fc9412bae676a6b675ef
Issue #20246: Fix test failures on FreeBSD. Patch by Ryan Smith-Roberts.
diff --git a/Lib/test/test_socket.py b/Lib/test/test_socket.py
--- Lib/test/test_socket.py
+++ Lib/test/test_socket.py
@@ -1620,6 +1620,16 @@ class BufferIOTest(SocketConnectedTest):
_testRecvFromIntoMemoryview = _testRecvFromIntoArray
+ def testRecvFromIntoSmallBuffer(self):
+ # See issue #20246.
+ buf = bytearray(8)
+ self.assertRaises(ValueError, self.cli_conn.recvfrom_into, buf, 1024)
+
+ def _testRecvFromIntoSmallBuffer(self):
+ with test_support.check_py3k_warnings():
+ buf = buffer(MSG)
+ self.serv_conn.send(buf)
+
TIPC_STYPE = 2000
TIPC_LOWER = 200
diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
--- Modules/socketmodule.c
+++ Modules/socketmodule.c
@@ -2742,6 +2742,10 @@ sock_recvfrom_into(PySocketSockObject *s
if (recvlen == 0) {
/* If nbytes was not specified, use the buffer's length */
recvlen = buflen;
+ } else if (recvlen > buflen) {
+ PyErr_SetString(PyExc_ValueError,
+ "nbytes is greater than the length of the buffer");
+ goto error;
}
readlen = sock_recvfrom_guts(s, buf.buf, recvlen, flags, &addr);
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