From bb8b91e1b0ba3ecc44c629da8d45368f8ff6fc32 Mon Sep 17 00:00:00 2001
From: Donat Zenichev <dzenichev@sipwise.com>
Date: Wed, 20 May 2026 18:43:58 +0200
Subject: [PATCH] MT#61856 control_ng: `json_list_iter()` handle
 `item_callback`

If any caller passes NULL for item callback and
then receives a JSON with a nested object/list/int, this can crash.

Change-Id: I69fbb9fec76305f6e1ed9ea5b25a50a7ee85c454
---
 daemon/control_ng.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/daemon/control_ng.c b/daemon/control_ng.c
index e77890867..b2516557a 100644
--- a/daemon/control_ng.c
+++ b/daemon/control_ng.c
@@ -365,7 +365,10 @@ static const char *json_list_iter(const ng_parser_t *parser, JsonNode *list,
 				err = str_callback(STR_PTR(s), i, arg);
 		}
 		else
-			err = item_callback(parser, n, arg);
+			if (item_callback)
+				err = item_callback(parser, n, arg);
+			else
+				ilog(LOG_DEBUG, "Ignoring non-string value in list");
 		if (err)
 			return err;
 	}