src/action_show_graph_json.c: Fix memory corruption.

diff --git a/src/action_show_graph_json.c b/src/action_show_graph_json.c
index 0820fb025614997ae39aca7737ded1406c82a75f..6d6e156ebee938f4f9695bb85cc62022b36bab7f 100644 (file)
--- a/src/action_show_graph_json.c
+++ b/src/action_show_graph_json.c
@@ -48,7 +48,7 @@ static void write_callback (__attribute__((unused)) void *ctx, /* {{{ */
 
 int action_show_graph_json (void) /* {{{ */
 {
-  graph_config_t *cfg;
+  graph_config_t const *cfg;
 
   yajl_gen_config handler_config;
   yajl_gen handler;
@@ -70,10 +70,7 @@ int action_show_graph_json (void) /* {{{ */
       /* alloc functions = */ NULL,
       /* context = */ NULL);
   if (handler == NULL)
-  {
-    graph_destroy (cfg);
     return (-1);
-  }
 
   printf ("Content-Type: application/json\n");
 
@@ -87,7 +84,6 @@ int action_show_graph_json (void) /* {{{ */
 
   status = graph_to_json (cfg, handler);
 
-  graph_destroy (cfg);
   yajl_gen_free (handler);
 
   return (status);

diff --git a/src/graph_list.h b/src/graph_list.h
index ff35f18e06d545fbb38fca7d7c2364c2017def00..a2a61e62ec0fc0b4ca936d8ab7a5365e1543de79 100644 (file)
--- a/src/graph_list.h
+++ b/src/graph_list.h
@@ -38,6 +38,15 @@ int gl_config_submit (void);
 
 int gl_register_data_provider (const char *name, data_provider_t *p);
 
+/*
+ * Returns the currently "selected" graph config.
+ *
+ * This function evaluates the HTTP query parameters and searches for a
+ * matching graph config structure. If a matching graph config is found, it
+ * will return a pointer to the graph config. Do *not* free or call
+ * graph_destroy() on this pointer. If no graph is found or parameters are
+ * incomplete, NULL is returned.
+ */
 graph_config_t *gl_graph_get_selected (void);
 
 int gl_graph_get_all (_Bool include_dynamic,