From 3575c371697a07995c3e65ae03aed55262ab00ed Mon Sep 17 00:00:00 2001
From: Frantisek Sumsal <frantisek@sumsal.cz>
Date: Sun, 21 May 2023 21:00:26 +0200
Subject: [PATCH] shared: correctly propagate possible allocation errors

instead of just asserting in case the memstream couldn't be resized.

Found by Nallocufuzz.
---
 src/shared/json.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/shared/json.c b/src/shared/json.c
index 8962173b3a..904b26f986 100644
--- a/src/shared/json.c
+++ b/src/shared/json.c
@@ -1788,7 +1788,9 @@ int json_variant_format(JsonVariant *v, JsonFormatFlags flags, char **ret) {
                 if (!f)
                         return -ENOMEM;
 
-                json_variant_dump(v, flags, f, NULL);
+                r = json_variant_dump(v, flags, f, NULL);
+                if (r < 0)
+                        return r;
 
                 /* Add terminating 0, so that the output buffer is a valid string. */
                 fputc('\0', f);