Fixed memory leaks (related to bug #52361)

Zend/zend_exceptions.c

@@ -81,7 +81,7 @@ void zend_exception_restore(TSRMLS_D) /* {{{ */
 }
 /* }}} */
 
-void zend_throw_exception_internal(zval *exception TSRMLS_DC) /* {{{ */
+ZEND_API void zend_throw_exception_internal(zval *exception TSRMLS_DC) /* {{{ */
 {
 #ifdef HAVE_DTRACE
 	if (DTRACE_EXCEPTION_THROWN_ENABLED()) {
@@ -580,6 +580,7 @@ ZEND_METHOD(exception, __toString)
 		zend_call_function(&fci, NULL TSRMLS_CC);
 
 		if (Z_TYPE_P(trace) != IS_STRING) {
+			zval_ptr_dtor(&trace);
 			trace = NULL;
 		}
 
@@ -600,6 +601,11 @@ ZEND_METHOD(exception, __toString)
 		zval_dtor(&line);
 
 		exception = zend_read_property(default_exception_ce, exception, "previous", sizeof("previous")-1, 0 TSRMLS_CC);
+
+		if (trace) {
+			zval_ptr_dtor(&trace);
+		}
+
 	}
 	zval_dtor(&fname);
 
@@ -607,10 +613,6 @@ ZEND_METHOD(exception, __toString)
 	 * the result in uncaught exception handlers without memleaks. */
 	zend_update_property_string(default_exception_ce, getThis(), "string", sizeof("string")-1, str TSRMLS_CC);
 
-	if (trace) {
-		zval_ptr_dtor(&trace);
-	}
-
 	RETURN_STRINGL(str, len, 0);
 }
 /* }}} */