Index: sys/kern/uipc_socket.c
===================================================================
--- sys/kern/uipc_socket.c
+++ sys/kern/uipc_socket.c
@@ -1893,6 +1893,8 @@
 				VNET_SO_ASSERT(so);
 				error = (*pr->pr_domain->dom_externalize)
 				    (cm, controlp, flags);
+				if (error != 0)
+					goto release;
 				SOCKBUF_LOCK(&so->so_rcv);
 			} else if (controlp != NULL)
 				*controlp = cm;
@@ -2518,6 +2520,10 @@
 			if (pr->pr_domain->dom_externalize != NULL) {
 				error = (*pr->pr_domain->dom_externalize)
 				    (cm, controlp, flags);
+				if (error != 0) {
+					m_freem(m);
+					return (error);
+				}
 			} else if (controlp != NULL)
 				*controlp = cm;
 			else