Fix a variadic-functions-related crash

Currently, we're not supporting virtual-patching on
variadic functions. The commit makes it clear,
and fix the related crash.

This should close #157

3 files changed, 28 insertions, 3 deletions

diff --git a/src/sp_disabled_functions.c b/src/sp_disabled_functions.c
index e279e5f..0e05f4e 100644
--- a/src/sp_disabled_functions.c
+++ b/src/sp_disabled_functions.c
@@ -305,9 +305,16 @@ bool should_disable(zend_execute_data* execute_data, const char* builtin_name,
     /* Check if we filter on parameter value*/
     if (config_node->param || config_node->r_param ||
         (config_node->pos != -1)) {
-      if (false == is_param_matching(execute_data, config_node, builtin_name,
-                                     builtin_param, &arg_name,
-                                     builtin_param_name, &arg_value_str)) {
+      if (!builtin_name && execute_data->func->op_array.arg_info->is_variadic) {
+        sp_log_err(
+            "disable_function",
+            "Snuffleupagus doesn't support variadic functions yet, sorry. "
+            "Check https://github.com/nbs-system/snuffleupagus/issues/164 for "
+            "details.");
+      } else if (false == is_param_matching(execute_data, config_node,
+                                            builtin_name, builtin_param,
+                                            &arg_name, builtin_param_name,
+                                            &arg_value_str)) {
         goto next;
       }
     }
diff --git a/src/tests/config/config_disabled_functions_variadic.ini b/src/tests/config/config_disabled_functions_variadic.ini
new file mode 100644
index 0000000..cd1028d
--- /dev/null
+++ b/src/tests/config/config_disabled_functions_variadic.ini
@@ -0,0 +1 @@
+sp.disable_function.function("foo").param("$b").value("1337").drop();
diff --git a/src/tests/disabled_functions_variadic.phpt b/src/tests/disabled_functions_variadic.phpt
new file mode 100644
index 0000000..53b4630
--- /dev/null
+++ b/src/tests/disabled_functions_variadic.phpt
@@ -0,0 +1,17 @@
+--TEST--
+Disable functions - support for variadic functions
+--SKIPIF--
+<?php if (!extension_loaded("snuffleupagus")) die "skip"; ?>
+--INI--
+sp.configuration_file={PWD}/config/config_disabled_functions_variadic.ini
+--FILE--
+<?php 
+function foo(...$b) {
+        return count($b);
+}
+
+echo foo(5, 4, 3, 2, 1);
+?>
+--EXPECTF--
+[snuffleupagus][0.0.0.0][disable_function][error] Snuffleupagus doesn't support variadic functions yet, sorry. Check https://github.com/nbs-system/snuffleupagus/issues/164 for details.
+[snuffleupagus][0.0.0.0][disabled_function][drop] The call to the function 'foo' in %a/disabled_functions_variadic.php:2 has been disabled.