From 56909de01520b20bde468765d1871dd7de7e987c Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Tue, 9 Feb 2021 16:39:49 +0100
Subject: [PATCH] format-table: when generating json, synthesize "null" for
 invalid ifindex

This matches what we do for other cell types that have an invalid value.
---
 src/shared/format-table.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/shared/format-table.c b/src/shared/format-table.c
index 92f82dd5b2..05bcff0095 100644
--- a/src/shared/format-table.c
+++ b/src/shared/format-table.c
@@ -2478,6 +2478,9 @@ static int table_data_to_json(TableData *d, JsonVariant **ret) {
                 return json_variant_new_integer(ret, d->percent);
 
         case TABLE_IFINDEX:
+                if (d->ifindex <= 0)
+                        return json_variant_new_null(ret);
+
                 return json_variant_new_integer(ret, d->ifindex);
 
         case TABLE_IN_ADDR: