script: Don't crash for scripts without input validation functions

commit 5d1b49c601a085120e834c1e9134593318465eec adds support for
filtering input to plymouthd and the script plugin.

The script plugin additions, unfortunately, fail to properly handle
scripts that don't add a validation function.

This commit fixes that by assuming no validation function means
no filtering.

Closes: https://gitlab.freedesktop.org/plymouth/plymouth/-/issues/175

diff --git a/src/plugins/splash/script/script-lib-plymouth.c b/src/plugins/splash/script/script-lib-plymouth.c
index 6be7199e3d7acc5c68d7096c69dd125814e08484..4848580e71b188ad7c1cfdb7554b63158b62dce1 100644 (file)
--- a/src/plugins/splash/script/script-lib-plymouth.c
+++ b/src/plugins/splash/script/script-lib-plymouth.c
@@ -387,6 +387,10 @@ bool script_lib_plymouth_on_validate_input (script_state_t             *state,
                                             const char                 *add_text)
 {
         bool input_valid;
+
+        if (script_obj_is_null (data->script_validate_input_func))
+                return true;
+
         script_obj_t *entry_text_obj = script_obj_new_string (entry_text);
         script_obj_t *add_text_obj = script_obj_new_string (add_text);
         script_return_t ret = script_execute_object (state,