If accept(), etc. return a larger addrlen than was supplied,
ignore it and use the original buffer length.

diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -1026,13 +1026,22 @@ makebdaddr(bdaddr_t *bdaddr)
 
 /*ARGSUSED*/
 static PyObject *
-makesockaddr(SOCKET_T sockfd, struct sockaddr *addr, size_t addrlen, int proto)
+makesockaddr(SOCKET_T sockfd, struct sockaddr *addr, socklen_t addrlen,
+             socklen_t buflen, int proto)
 {
     if (addrlen == 0) {
         /* No address -- may be recvfrom() from known socket */
         Py_INCREF(Py_None);
         return Py_None;
     }
+    /* buflen is the length of the buffer containing the address, and
+       addrlen is either the same, or is the length returned by the OS
+       after writing an address into the buffer.  Some systems return
+       the length they would have written if there had been space
+       (e.g. when an oversized AF_UNIX address has its sun_path
+       truncated). */
+    if (addrlen > buflen)
+        addrlen = buflen;
 
     switch (addr->sa_family) {
 
@@ -1684,12 +1693,14 @@ sock_accept(PySocketSockObject *s)
     sock_addr_t addrbuf;
     SOCKET_T newfd = INVALID_SOCKET;
     socklen_t addrlen;
+    socklen_t buflen;
     PyObject *sock = NULL;
     PyObject *addr = NULL;
     PyObject *res = NULL;
     int timeout;
     if (!getsockaddrlen(s, &addrlen))
         return NULL;
+    buflen = addrlen;
     memset(&addrbuf, 0, addrlen);
 
     if (!IS_SELECTABLE(s))
@@ -1719,7 +1730,7 @@ sock_accept(PySocketSockObject *s)
     }
 
     addr = makesockaddr(s->sock_fd, SAS2SA(&addrbuf),
-                        addrlen, s->sock_proto);
+                        addrlen, buflen, s->sock_proto);
     if (addr == NULL)
         goto finally;
 
@@ -2169,16 +2180,18 @@ sock_getsockname(PySocketSockObject *s)
     sock_addr_t addrbuf;
     int res;
     socklen_t addrlen;
+    socklen_t buflen;
 
     if (!getsockaddrlen(s, &addrlen))
         return NULL;
+    buflen = addrlen;
     memset(&addrbuf, 0, addrlen);
     Py_BEGIN_ALLOW_THREADS
     res = getsockname(s->sock_fd, SAS2SA(&addrbuf), &addrlen);
     Py_END_ALLOW_THREADS
     if (res < 0)
         return s->errorhandler();
-    return makesockaddr(s->sock_fd, SAS2SA(&addrbuf), addrlen,
+    return makesockaddr(s->sock_fd, SAS2SA(&addrbuf), addrlen, buflen,
                         s->sock_proto);
 }
 
@@ -2198,16 +2211,18 @@ sock_getpeername(PySocketSockObject *s)
     sock_addr_t addrbuf;
     int res;
     socklen_t addrlen;
+    socklen_t buflen;
 
     if (!getsockaddrlen(s, &addrlen))
         return NULL;
+    buflen = addrlen;
     memset(&addrbuf, 0, addrlen);
     Py_BEGIN_ALLOW_THREADS
     res = getpeername(s->sock_fd, SAS2SA(&addrbuf), &addrlen);
     Py_END_ALLOW_THREADS
     if (res < 0)
         return s->errorhandler();
-    return makesockaddr(s->sock_fd, SAS2SA(&addrbuf), addrlen,
+    return makesockaddr(s->sock_fd, SAS2SA(&addrbuf), addrlen, buflen,
                         s->sock_proto);
 }
 
@@ -2476,11 +2491,13 @@ sock_recvfrom_guts(PySocketSockObject *s
     int timeout;
     Py_ssize_t n = -1;
     socklen_t addrlen;
+    socklen_t buflen;
 
     *addr = NULL;
 
     if (!getsockaddrlen(s, &addrlen))
         return -1;
+    buflen = addrlen;
 
     if (!IS_SELECTABLE(s)) {
         select_error();
@@ -2518,7 +2535,7 @@ sock_recvfrom_guts(PySocketSockObject *s
     }
 
     if (!(*addr = makesockaddr(s->sock_fd, SAS2SA(&addrbuf),
-                               addrlen, s->sock_proto)))
+                               addrlen, buflen, s->sock_proto)))
         return -1;
 
     return n;
@@ -4110,7 +4127,8 @@ socket_getaddrinfo(PyObject *self, PyObj
     for (res = res0; res; res = res->ai_next) {
         PyObject *single;
         PyObject *addr =
-            makesockaddr(-1, res->ai_addr, res->ai_addrlen, protocol);
+            makesockaddr(-1, res->ai_addr, res->ai_addrlen, res->ai_addrlen,
+                         protocol);
         if (addr == NULL)
             goto err;
         single = Py_BuildValue("iiisO", res->ai_family,