Return error_zval form get_property_ptr_ptr on exception

This goes in the reverse direction of 4463acb.
After looking around a bit, it seems that we already check for
Z_ISERROR_P() on the get_property_ptr_ptr return value in other places.
So do this in zend_fetch_property_address() as well, and also make
sure that EG(error_zval) is indeed returned on exception in
get_property_ptr_ptr.

In particular, this fixes the duplicate exceptions that we used to
get because first get_property_ptr_ptr threw one and then
read_property throws the same exception again.

Author: nikic

Zend/tests/closure_038.phpt

@@ -58,10 +58,5 @@ int(24)
 Fatal error: Uncaught Error: Cannot access private property B::$x in %s:%d
 Stack trace:
 #0 %s(%d): Closure->{closure}()
-#1 {main}
-
-Next Error: Cannot access private property B::$x in %s:%d
-Stack trace:
-#0 %s(%d): Closure->{closure}()
 #1 {main}
   thrown in %s on line %d

Zend/tests/closure_039.phpt

@@ -58,10 +58,5 @@ int(24)
 Fatal error: Uncaught Error: Cannot access private property B::$x in %s:%d
 Stack trace:
 #0 %s(%d): Closure->{closure}()
-#1 {main}
-
-Next Error: Cannot access private property B::$x in %s:%d
-Stack trace:
-#0 %s(%d): Closure->{closure}()
 #1 {main}
   thrown in %s on line %d

Zend/zend_execute.c

@@ -2822,6 +2822,9 @@ static zend_always_inline void zend_fetch_property_address(zval *result, zval *c
 			}
 			return;
 		}
+	} else if (UNEXPECTED(Z_ISERROR_P(ptr))) {
+		ZVAL_ERROR(result);
+		return;
 	}
 
 	ZVAL_INDIRECT(result, ptr);
@@ -2858,7 +2861,7 @@ static zend_always_inline void zend_assign_to_property_reference(zval *container
 		variable_ptr = Z_INDIRECT_P(variable_ptr);
 	}
 
-	if (UNEXPECTED(Z_ISERROR_P(variable_ptr) || EG(exception))) {
+	if (UNEXPECTED(Z_ISERROR_P(variable_ptr))) {
 		variable_ptr = &EG(uninitialized_zval);
 	} else if (UNEXPECTED(Z_TYPE(variable) != IS_INDIRECT)) {
 		zend_throw_error(NULL, "Cannot assign by reference to overloaded object");

Zend/zend_object_handlers.c

@@ -1024,7 +1024,7 @@ ZEND_API zval *zend_std_get_property_ptr_ptr(zval *object, zval *member, int typ
 	zobj = Z_OBJ_P(object);
 	name = zval_try_get_tmp_string(member, &tmp_name);
 	if (UNEXPECTED(!name)) {
-		return NULL;
+		return &EG(error_zval);
 	}
 
 #if DEBUG_OBJECT_HANDLERS
@@ -1072,6 +1072,8 @@ ZEND_API zval *zend_std_get_property_ptr_ptr(zval *object, zval *member, int typ
 				zend_error(E_NOTICE, "Undefined property: %s::$%s", ZSTR_VAL(zobj->ce->name), ZSTR_VAL(name));
 			}
 		}
+	} else if (zobj->ce->__get == NULL) {
+		retval = &EG(error_zval);
 	}
 
 	zend_tmp_string_release(tmp_name);

tests/classes/static_properties_003_error4.phpt

@@ -17,11 +17,7 @@ try {
 ==Done==
 --EXPECTF--
 --> Access non-visible static prop like instance prop:
-Error: Cannot access protected property C::$y in %s:9
-Stack trace:
-#0 {main}
-
-Next Error: Cannot access protected property C::$y in %s:9
+Error: Cannot access protected property C::$y in %s:%d
 Stack trace:
 #0 {main}
 ==Done==