From c2d54aaede47244cbd8036a661ca8d24331bd845 Mon Sep 17 00:00:00 2001
From: Alexander Boettcher <alexander.boettcher@genode-labs.com>
Date: Thu, 25 Oct 2018 12:03:02 +0200
Subject: [PATCH] base: avoid null pointer warning in avl tree

Issue #3022
---
 repos/base/src/lib/base/avl_tree.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/repos/base/src/lib/base/avl_tree.cc b/repos/base/src/lib/base/avl_tree.cc
index 16b2341d8..4e20c0e3f 100644
--- a/repos/base/src/lib/base/avl_tree.cc
+++ b/repos/base/src/lib/base/avl_tree.cc
@@ -47,13 +47,13 @@ void Avl_node_base::_rotate_subtree(Avl_node_base *node, Side side, Policy &poli
 	int i = (node == _child[0]) ? LEFT : RIGHT;
 
 	Avl_node_base *node_r   = node->_child[!side];
-	Avl_node_base *node_r_l = node_r->_child[side];
-
 	if (!node_r) {
 		error("avl rotation node_r is invalid");
 		return;
 	}
 
+	Avl_node_base *node_r_l = node_r->_child[side];
+
 	/* simple rotation */
 	if (node_r->_bias() == !side) {