src/utils_cmd_listval.c: Free memory returned by `uc_get_names'.

We've run into a memory leak in collectd, triggered by usage of 'listval'
via the unixsock plugin.

When making a 'listval' call, utils_cmd_listval.c:handle_listval() calls
utils_cache.c:uc_get_names() to retrieve a list of active value names from the
internal cache. uc_get_names() uses realloc() to allocate memory in which to
store the list, and returns pointers.

handle_listval() does not perform a free() on the returned memory. Each time
listval is called, some memory is leaked. handle_getval() does not suffer from
the same problem - a free() is called in that case.

diff --git a/src/utils_cmd_listval.c b/src/utils_cmd_listval.c
index bca83a9..072593f 100644 (file)
--- a/src/utils_cmd_listval.c
+++ b/src/utils_cmd_listval.c
@@ -79,8 +79,14 @@ int handle_listval (FILE *fh, char *buffer)
   print_to_socket (fh, "%i Value%s found\n",
       (int) number, (number == 1) ? "" : "s");
   for (i = 0; i < number; i++)
+  {
     print_to_socket (fh, "%u %s\n", (unsigned int) times[i], names[i]);
+    sfree(names[i]);
+  }
 
+  sfree(names);
+  sfree(times);
+   
   return (0);
 } /* int handle_listval */