powerdns plugin: Ensure powerdns_get_data() returns a non-NULL buffer.

[collectd.git] / src / powerdns.c

diff --git a/src/powerdns.c b/src/powerdns.c
index f2149ef..fa3eef3 100644 (file)
--- a/src/powerdns.c
+++ b/src/powerdns.c
@@ -598,6 +598,9 @@ static int powerdns_read_server(list_item_t *item) /* {{{ */
   status = powerdns_get_data(item, &buffer, &buffer_size);
   if (status != 0)
     return (-1);
+  if ((buffer == NULL) || (buffer_size == 0)) {
+    return EINVAL;
+  }
 
   if (item->fields_num != 0) {
     fields = (const char *const *)item->fields;