From 90537d143aad875d78ecc9186c6bc5eebe5d5de7 Mon Sep 17 00:00:00 2001
From: Olaf Bergmann <bergmann@tzi.org>
Date: Tue, 25 May 2021 10:25:00 +0200
Subject: [PATCH] resource.c: Fix memory leak in coap_add_observer()

If no observer exists, a new cache key is created and storage for a
new subscription may be allocated. If this fails, the newly created
cache key must be released.

This fixes CID 1504918.
---
 src/resource.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/resource.c b/src/resource.c
index d6586ece..48d496a4 100644
--- a/src/resource.c
+++ b/src/resource.c
@@ -759,6 +759,7 @@ static const uint16_t cache_ignore_options[] = { COAP_OPTION_ETAG };
   s = COAP_MALLOC_TYPE(subscription);
 
   if (!s) {
+    coap_delete_cache_key(cache_key);
     return NULL;
   }