Author: rlibby
Date: Mon Nov 25 22:25:10 2019
New Revision: 355102
URL: https://svnweb.freebsd.org/changeset/base/355102

Log:
  in6_joingroup_locked: need if_addr_lock around in6m_disconnect_locked
  
  It looks like the call that requires the lock was introduced in r337866.
  
  Reviewed by:  hselasky
  Sponsored by: Dell EMC Isilon
  Differential Revision:        https://reviews.freebsd.org/D20739

Modified:
  head/sys/netinet6/in6_mcast.c

Modified: head/sys/netinet6/in6_mcast.c
==============================================================================
--- head/sys/netinet6/in6_mcast.c       Mon Nov 25 21:21:37 2019        
(r355101)
+++ head/sys/netinet6/in6_mcast.c       Mon Nov 25 22:25:10 2019        
(r355102)
@@ -1267,6 +1267,7 @@ out_in6m_release:
                struct epoch_tracker et;
 
                CTR2(KTR_MLD, "%s: dropping ref on %p", __func__, inm);
+               IF_ADDR_WLOCK(ifp);
                NET_EPOCH_ENTER(et);
                CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
                        if (ifma->ifma_protospec == inm) {
@@ -1277,6 +1278,7 @@ out_in6m_release:
                in6m_disconnect_locked(&inmh, inm);
                in6m_rele_locked(&inmh, inm);
                NET_EPOCH_EXIT(et);
+               IF_ADDR_WUNLOCK(ifp);
        } else {
                *pinm = inm;
        }
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