amt: add missing regeneration nonce logic in request logic

[ Upstream commit 627f169 ]

When AMT gateway starts sending a new request message, it should
regenerate the nonce variable.

Fixes: cbc21dc ("amt: add data plane of amt interface")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/net/amt.c

@@ -963,9 +963,13 @@ static void amt_event_send_request(struct amt_dev *amt)
 		amt->remote_ip = 0;
 		amt_update_gw_status(amt, AMT_STATUS_INIT, false);
 		amt->req_cnt = 0;
+		amt->nonce = 0;
 		goto out;
 	}
 
+	if (!amt->req_cnt)
+		get_random_bytes(&amt->nonce, sizeof(__be32));
+
 	amt_send_request(amt, false);
 	amt_send_request(amt, true);
 	amt_update_gw_status(amt, AMT_STATUS_SENT_REQUEST, true);