inet{6}_request_sock: Init ->opt and ->pktopts in the constructor

Wei Yongjun noticed that we may call reqsk_free on request sock objects where
the opt fields may not be initialized, fix it by introducing inet_reqsk_alloc
where we initialize ->opt to NULL and set ->pktopts to NULL in
inet6_reqsk_alloc.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h
index a42cd63..9fabe5b 100644
--- a/include/net/inet_sock.h
+++ b/include/net/inet_sock.h
@@ -197,4 +197,14 @@
 	return skb->rtable->rt_iif;
 }
 
+static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops)
+{
+	struct request_sock *req = reqsk_alloc(ops);
+
+	if (req != NULL)
+		inet_rsk(req)->opt = NULL;
+
+	return req;
+}
+
 #endif	/* _INET_SOCK_H */