Fix address violation found by AddressSanitizer

* src/process.c (connect_network_socket):
Use struct sockaddr_storage, not struct sockaddr_in, to store info
about a socket address.  Problem reported by Philipp Stephani in:
http://lists.gnu.org/archive/html/emacs-devel/2017-05/msg00314.html
This fix is based on a patch by Philipp in:
http://lists.gnu.org/archive/html/emacs-devel/2017-05/msg00357.html

1 files changed, 22 insertions, 6 deletions

diff --git a/src/process.c b/src/process.c
index 0edd092ef66..4a286391f88 100644
--- a/src/process.c
+++ b/src/process.c
@@ -3420,16 +3420,32 @@ connect_network_socket (Lisp_Object proc, Lisp_Object addrinfos,
 #ifdef HAVE_GETSOCKNAME
           if (p->port == 0)
             {
-              struct sockaddr_in sa1;
+              struct sockaddr_storage sa1;
               socklen_t len1 = sizeof (sa1);
               if (getsockname (s, (struct sockaddr *)&sa1, &len1) == 0)
                 {
-                  Lisp_Object service;
-                  service = make_number (ntohs (sa1.sin_port));
-                  contact = Fplist_put (contact, QCservice, service);
                   /* Save the port number so that we can stash it in
                      the process object later.  */
-                  ((struct sockaddr_in *)sa)->sin_port = sa1.sin_port;
+                  int port = -1;
+                  switch (family)
+                    {
+                    case AF_INET:
+                      ((struct sockaddr_in *) sa)->sin_port
+                        = port = ((struct sockaddr_in *) &sa1)->sin_port;
+                      break;
+# ifdef AF_INET6
+                    case AF_INET6:
+                      ((struct sockaddr_in6 *) sa)->sin6_port
+                        = port = ((struct sockaddr_in6 *) &sa1)->sin6_port;
+                      break;
+# endif
+                    }
+
+                  if (0 <= port)
+                    {
+                      Lisp_Object service = make_number (ntohs (port));
+                      contact = Fplist_put (contact, QCservice, service);
+                    }
                 }
             }
 #endif
@@ -3535,7 +3551,7 @@ connect_network_socket (Lisp_Object proc, Lisp_Object addrinfos,
 #ifdef HAVE_GETSOCKNAME
       if (!p->is_server)
         {
-          struct sockaddr_in sa1;
+          struct sockaddr_storage sa1;
           socklen_t len1 = sizeof (sa1);
           if (getsockname (s, (struct sockaddr *)&sa1, &len1) == 0)
             contact = Fplist_put (contact, QClocal,