Initialize reallocated memory in gvm_hosts_add

CHANGELOG.md

@@ -89,6 +89,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Adding initialization to struct scanner in `boreas/util_tests.c`. [#438](https://github.com/greenbone/gvm-libs/pull/438)
 - Fix warnings about uninitialized variables. [#448](https://github.com/greenbone/gvm-libs/pull/448)
 - Split the log message into smaller pieces when syslog is the log destination.  [#455](https://github.com/greenbone/gvm-libs/pull/455)
+- Initialize reallocated memory in gvm_hosts_add [#520](https://github.com/greenbone/gvm-libs/pull/520)
 
 ### Removed
 

base/hosts.c

@@ -957,6 +957,8 @@ gvm_hosts_add (gvm_hosts_t *hosts, gvm_host_t *host)
       hosts->max_size *= 4;
       hosts->hosts =
         g_realloc_n (hosts->hosts, hosts->max_size, sizeof (*hosts->hosts));
+      memset (hosts->hosts + hosts->count, '\0',
+              (hosts->max_size - hosts->count) * sizeof (gvm_host_t *));
     }
   hosts->hosts[hosts->count] = host;
   hosts->count++;