Fix SEND_USER with ref arg

Even though the input is not a reference (or not treated as such),
we still need to create a reference to satisfy the function
signature. Various code relies on reference arguments actually
being references. In this particular case, it would result in
a JIT crash.

The zend_call_function() implementation already handled this
correctly.

Author: nikic

Zend/tests/call_user_func_by_ref.phpt

@@ -0,0 +1,17 @@
+--TEST--
+call_user_func() with ref arg and type check
+--FILE--
+<?php
+
+function test(Type &$ref) {
+}
+try {
+    call_user_func('test', 0);
+} catch (TypeError $e) {
+    echo $e->getMessage(), "\n";
+}
+
+?>
+--EXPECTF--
+Warning: test(): Argument #1 ($ref) must be passed by reference, value given in %s on line %d
+test(): Argument #1 ($ref) must be of type Type, int given, called in %s on line %d

Zend/tests/closure_invoke_ref_warning.phpt

@@ -9,5 +9,3 @@ call_user_func([$test, '__invoke'], null);
 ?>
 --EXPECTF--
 Warning: Closure::__invoke(): Argument #1 ($arg) must be passed by reference, value given in %s on line %d
-
-Warning: {closure}(): Argument #1 ($arg) must be passed by reference, value given in %s on line %d

Zend/zend_vm_def.h

@@ -5326,13 +5326,16 @@ ZEND_VM_HANDLER(120, ZEND_SEND_USER, CONST|TMP|VAR|CV, NUM)
 
 	SAVE_OPLINE();
 
+	arg = GET_OP1_ZVAL_PTR_DEREF(BP_VAR_R);
+	param = ZEND_CALL_VAR(EX(call), opline->result.var);
 	if (UNEXPECTED(ARG_MUST_BE_SENT_BY_REF(EX(call)->func, opline->op2.num))) {
 		zend_param_must_be_ref(EX(call)->func, opline->op2.num);
+		Z_TRY_ADDREF_P(arg);
+		ZVAL_NEW_REF(param, arg);
+	} else {
+		ZVAL_COPY(param, arg);
 	}
 
-	arg = GET_OP1_ZVAL_PTR_DEREF(BP_VAR_R);
-	param = ZEND_CALL_VAR(EX(call), opline->result.var);
-	ZVAL_COPY(param, arg);
 	FREE_OP1();
 	ZEND_VM_NEXT_OPCODE_CHECK_EXCEPTION();
 }

Zend/zend_vm_execute.h

@@ -4477,14 +4477,16 @@ static ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_SEND_USER_SPEC_CONST_HANDLER(Z
 
 	SAVE_OPLINE();
 
+	arg = RT_CONSTANT(opline, opline->op1);
+	param = ZEND_CALL_VAR(EX(call), opline->result.var);
 	if (UNEXPECTED(ARG_MUST_BE_SENT_BY_REF(EX(call)->func, opline->op2.num))) {
 		zend_param_must_be_ref(EX(call)->func, opline->op2.num);
+		Z_TRY_ADDREF_P(arg);
+		ZVAL_NEW_REF(param, arg);
+	} else {
+		ZVAL_COPY(param, arg);
 	}
 
-	arg = RT_CONSTANT(opline, opline->op1);
-	param = ZEND_CALL_VAR(EX(call), opline->result.var);
-	ZVAL_COPY(param, arg);
-
 	ZEND_VM_NEXT_OPCODE_CHECK_EXCEPTION();
 }
 
@@ -18738,13 +18740,16 @@ static ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_SEND_USER_SPEC_TMP_HANDLER(ZEN
 
 	SAVE_OPLINE();
 
+	arg = _get_zval_ptr_tmp(opline->op1.var EXECUTE_DATA_CC);
+	param = ZEND_CALL_VAR(EX(call), opline->result.var);
 	if (UNEXPECTED(ARG_MUST_BE_SENT_BY_REF(EX(call)->func, opline->op2.num))) {
 		zend_param_must_be_ref(EX(call)->func, opline->op2.num);
+		Z_TRY_ADDREF_P(arg);
+		ZVAL_NEW_REF(param, arg);
+	} else {
+		ZVAL_COPY(param, arg);
 	}
 
-	arg = _get_zval_ptr_tmp(opline->op1.var EXECUTE_DATA_CC);
-	param = ZEND_CALL_VAR(EX(call), opline->result.var);
-	ZVAL_COPY(param, arg);
 	zval_ptr_dtor_nogc(EX_VAR(opline->op1.var));
 	ZEND_VM_NEXT_OPCODE_CHECK_EXCEPTION();
 }
@@ -21311,13 +21316,16 @@ static ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_SEND_USER_SPEC_VAR_HANDLER(ZEN
 
 	SAVE_OPLINE();
 
+	arg = _get_zval_ptr_var_deref(opline->op1.var EXECUTE_DATA_CC);
+	param = ZEND_CALL_VAR(EX(call), opline->result.var);
 	if (UNEXPECTED(ARG_MUST_BE_SENT_BY_REF(EX(call)->func, opline->op2.num))) {
 		zend_param_must_be_ref(EX(call)->func, opline->op2.num);
+		Z_TRY_ADDREF_P(arg);
+		ZVAL_NEW_REF(param, arg);
+	} else {
+		ZVAL_COPY(param, arg);
 	}
 
-	arg = _get_zval_ptr_var_deref(opline->op1.var EXECUTE_DATA_CC);
-	param = ZEND_CALL_VAR(EX(call), opline->result.var);
-	ZVAL_COPY(param, arg);
 	zval_ptr_dtor_nogc(EX_VAR(opline->op1.var));
 	ZEND_VM_NEXT_OPCODE_CHECK_EXCEPTION();
 }
@@ -37618,14 +37626,16 @@ static ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_SEND_USER_SPEC_CV_HANDLER(ZEND
 
 	SAVE_OPLINE();
 
+	arg = _get_zval_ptr_cv_deref_BP_VAR_R(opline->op1.var EXECUTE_DATA_CC);
+	param = ZEND_CALL_VAR(EX(call), opline->result.var);
 	if (UNEXPECTED(ARG_MUST_BE_SENT_BY_REF(EX(call)->func, opline->op2.num))) {
 		zend_param_must_be_ref(EX(call)->func, opline->op2.num);
+		Z_TRY_ADDREF_P(arg);
+		ZVAL_NEW_REF(param, arg);
+	} else {
+		ZVAL_COPY(param, arg);
 	}
 
-	arg = _get_zval_ptr_cv_deref_BP_VAR_R(opline->op1.var EXECUTE_DATA_CC);
-	param = ZEND_CALL_VAR(EX(call), opline->result.var);
-	ZVAL_COPY(param, arg);
-
 	ZEND_VM_NEXT_OPCODE_CHECK_EXCEPTION();
 }