From c4ff9c5def1aaf76f7cec82d9aa7e5cb1b77f044 Mon Sep 17 00:00:00 2001
From: NIIBE Yutaka <gniibe@fsij.org>
Date: Fri, 28 Jun 2024 13:51:22 +0900
Subject: [PATCH] agent: Require use of "SCD DEVINFO --watch" command with
 socket.

* agent/call-scd.c (agent_card_devinfo): Check if client connects
by a socket.

--

GnuPG-bug-id: 7151
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
---
 agent/call-scd.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/agent/call-scd.c b/agent/call-scd.c
index 70bd78e94..dd13c8e1d 100644
--- a/agent/call-scd.c
+++ b/agent/call-scd.c
@@ -1189,6 +1189,9 @@ agent_card_devinfo (ctrl_t ctrl, void *assuan_context)
   int rc;
   gnupg_fd_t client_fds[2];
 
+  if (ctrl->thread_startup.fd == GNUPG_INVALID_FD)
+    return GPG_ERR_INV_HANDLE;
+
   rc = daemon_start (DAEMON_SCD, ctrl, 1);
   if (rc)
     return rc;