File php-CVE-2016-7478.patch of Package php7.7220

Index: php-7.0.7/Zend/zend_exceptions.c
===================================================================
--- php-7.0.7.orig/Zend/zend_exceptions.c	2016-05-25 15:13:18.000000000 +0200
+++ php-7.0.7/Zend/zend_exceptions.c	2017-02-15 08:56:58.202890852 +0100
@@ -294,10 +294,7 @@ ZEND_METHOD(exception, __construct)
 	ZVAL_UNDEF(&value); \
 	pvalue = zend_read_property(i_get_exception_base(object), (object), name, sizeof(name) - 1, 1, &value); \
 	if(Z_TYPE_P(pvalue) != IS_UNDEF && Z_TYPE_P(pvalue) != type) { \
-		zval tmp; \
-		ZVAL_STRINGL(&tmp, name, sizeof(name) - 1); \
-		Z_OBJ_HANDLER_P(object, unset_property)(object, &tmp, NULL); \
-		zval_ptr_dtor(&tmp); \
+		zend_unset_property(i_get_exception_base(object), object, name, sizeof(name)-1); \
 	}
 
 ZEND_METHOD(exception, __wakeup)
@@ -310,7 +307,12 @@ ZEND_METHOD(exception, __wakeup)
 	CHECK_EXC_TYPE("file", IS_STRING);
 	CHECK_EXC_TYPE("line", IS_LONG);
 	CHECK_EXC_TYPE("trace", IS_ARRAY);
-	CHECK_EXC_TYPE("previous", IS_OBJECT);
+	pvalue = zend_read_property(i_get_exception_base(object), object, "previous", sizeof("previous")-1, 1, &value);
+	if (pvalue && Z_TYPE_P(pvalue) != IS_NULL && (Z_TYPE_P(pvalue) != IS_OBJECT ||
+			!instanceof_function(Z_OBJCE_P(pvalue), i_get_exception_base(object)) ||
+			pvalue == object)) {
+		zend_unset_property(i_get_exception_base(object), object, "previous", sizeof("previous")-1);
+	}
 }
 /* }}} */
 
@@ -769,11 +771,26 @@ ZEND_METHOD(exception, __toString)
 		zend_string_release(file);
 		zval_ptr_dtor(&trace);
 
+		Z_OBJPROP_P(exception)->u.v.nApplyCount++;
 		exception = GET_PROPERTY(exception, "previous");
+		if (exception && Z_TYPE_P(exception) == IS_OBJECT && Z_OBJPROP_P(exception)->u.v.nApplyCount > 0) {
+			break;
+		}
 	}
 	zval_dtor(&fname);
 
 	exception = getThis();
+	/* Reset apply counts */
+	while (exception && Z_TYPE_P(exception) == IS_OBJECT && (base_ce = i_get_exception_base(exception)) && instanceof_function(Z_OBJCE_P(exception), base_ce)) {
+		if (Z_OBJPROP_P(exception)->u.v.nApplyCount) {
+			Z_OBJPROP_P(exception)->u.v.nApplyCount--;
+		} else {
+			break;
+		}
+		exception = GET_PROPERTY(exception, "previous");
+	}
+
+	exception = getThis();
 	base_ce = i_get_exception_base(exception);
 
 	/* We store the result in the private property string so we can access