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Index: head/sys/dev/hyperv/netvsc/if_hn.c
===================================================================
--- head/sys/dev/hyperv/netvsc/if_hn.c
+++ head/sys/dev/hyperv/netvsc/if_hn.c
@@ -1161,6 +1161,13 @@
strcmp(ifp->if_dname, "vlan") == 0)
return (false);
+ /*
+ * During detach events ifp->if_addr might be NULL.
+ * Make sure the bcmp() below doesn't panic on that:
+ */
+ if (ifp->if_addr == NULL || hn_ifp->if_addr == NULL)
+ return (false);
+
if (bcmp(IF_LLADDR(ifp), IF_LLADDR(hn_ifp), ETHER_ADDR_LEN) != 0)
return (false);

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