Fixed bug #54265 (crash when variable gets reassigned in error handler)

diff --git a/NEWS b/NEWS
index 0678c24dd245faec708e89061e072b79e71c62af..0d1cfd451bfd12cd76fc34349934a515c7efa703 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -2,6 +2,8 @@
 |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 ?? Mar 2011, PHP 5.3.6
 - Zend Engine:
+  . Fixed bug #54265 (crash when variable gets reassigned in error handler).
+    (Dmitry)
   . Fixed bug #54262 (Crash when assigning value to a dimension in a non-array).
     (Dmitry)
 

diff --git a/Zend/tests/bug54265.phpt b/Zend/tests/bug54265.phpt
new file mode 100644 (file)
index 0000000..43db028
--- /dev/null
+++ b/Zend/tests/bug54265.phpt
@@ -0,0 +1,17 @@
+--TEST--
+Bug #54265 (crash when variable gets reassigned in error handler)
+--FILE--
+<?php
+function my_errorhandler($errno,$errormsg) {
+  global $my_var;
+  $my_var = 0;
+  echo "EROOR: $errormsg\n";
+}
+set_error_handler("my_errorhandler");
+$my_var = str_repeat("A",$my_var[0]->errormsg = "xyz");
+echo "ok\n";
+?>
+--EXPECT--
+EROOR: Creating default object from empty value
+ok
+

diff --git a/Zend/zend_execute.c b/Zend/zend_execute.c
index e270816d8b0ab2c0b33bbc62c086b8a7095a1eca..f10fce38dc2678763907804b3eb960b0218f07c4 100644 (file)
--- a/Zend/zend_execute.c
+++ b/Zend/zend_execute.c
@@ -536,10 +536,22 @@ static inline void zend_assign_to_object(znode *result, zval **object_ptr, zval
                    (Z_TYPE_P(object) == IS_BOOL && Z_LVAL_P(object) == 0) ||
                    (Z_TYPE_P(object) == IS_STRING && Z_STRLEN_P(object) == 0)) {
                        SEPARATE_ZVAL_IF_NOT_REF(object_ptr);
-                       zval_dtor(*object_ptr);
-                       object_init(*object_ptr);
                        object = *object_ptr;
+                       Z_ADDREF_P(object);
                        zend_error(E_STRICT, "Creating default object from empty value");
+                       if (Z_REFCOUNT_P(object) == 1) {
+                               /* object was removed by error handler, nothing to assign to */
+                               zval_ptr_dtor(&object);
+                               if (retval) {
+                                       *retval = &EG(uninitialized_zval);
+                                       PZVAL_LOCK(*retval);
+                               }
+                               FREE_OP(free_value);
+                               return;
+                       }
+                       Z_DELREF_P(object);
+                       zval_dtor(object);
+                       object_init(object);
                } else {
                        zend_error(E_WARNING, "Attempt to assign property of non-object");
                        if (!RETURN_VALUE_UNUSED(result)) {