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--- sys/netinet/in_mcast.c.orig 2009-08-03 08:13:06.000000000 +0000
+++ sys/netinet/in_mcast.c 2009-09-09 01:35:06.000000000 +0000
@@ -1964,4 +1964,8 @@
if (idx == -1) {
is_new = 1;
+ } else if (sopt->sopt_name == IP_ADD_MEMBERSHIP) {
+ /* Trying to join the same Any-source group again. */
+ error = EADDRINUSE;
+ goto out_inp_locked;
} else {
inm = imo->imo_membership[idx];
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