[glib] gsocket: fix joining/leaving multicast groups

[Dan Winship <danw src gnome org>]

commit c2acbc018269a052eb7546950088a0860e3b1545
Author: Wim Taymans <wim taymans collabora co uk>
Date:   Thu Nov 15 11:37:20 2012 +0100

    gsocket: fix joining/leaving multicast groups
    
    Initialize the structure passed to setsockopt to 0 to avoid random
    errors when joining or leaving a multicast group.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=688378

 gio/gsocket.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gio/gsocket.c b/gio/gsocket.c
index 93acd61..94e16a2 100644
--- a/gio/gsocket.c
+++ b/gio/gsocket.c
@@ -1952,6 +1952,7 @@ g_socket_multicast_group_operation (GSocket       *socket,
       struct ip_mreq mc_req;
 #endif
 
+      memset (&mc_req, 0, sizeof (mc_req));
       memcpy (&mc_req.imr_multiaddr, native_addr, sizeof (struct in_addr));
 
 #ifdef HAVE_IP_MREQN
@@ -1985,6 +1986,7 @@ g_socket_multicast_group_operation (GSocket       *socket,
     {
       struct ipv6_mreq mc_req_ipv6;
 
+      memset (&mc_req_ipv6, 0, sizeof (mc_req_ipv6));
       memcpy (&mc_req_ipv6.ipv6mr_multiaddr, native_addr, sizeof (struct in6_addr));
 #ifdef HAVE_IF_NAMETOINDEX
       if (iface)