processes plugin: Fix a possible segfault.

diff --git a/src/processes.c b/src/processes.c
index ccf1571f8ea6211e32defc2418a43212dff7826d..4b59351cba7df9933859e5ffd46801117a42377c 100644 (file)
--- a/src/processes.c
+++ b/src/processes.c
@@ -642,11 +642,14 @@ static int *ps_read_tasks (int pid)
 
        closedir (dh);
 
+       if (list_len == 0)
+               return (NULL);
+
        assert (list_len < list_size);
        assert (list[list_len] == 0);
 
        return (list);
-}
+} /* int *ps_read_tasks */
 
 int ps_read_process (int pid, procstat_t *ps, char *state)
 {