common: tree: Avoid a nullptr dereference.

5 years ago · eee302b9b9
1 changed files with 1 additions and 1 deletions
--- a/src/common/tree.h
+++ b/src/common/tree.h
@ -322,7 +322,7 @@ void RB_INSERT_COLOR(RBHead<Node>* head, Node* elm) {
 template <typename Node>
 void RB_REMOVE_COLOR(RBHead<Node>* head, Node* parent, Node* elm) {
    Node* tmp;
-    while ((elm == nullptr || RB_IS_BLACK(elm)) && elm != head->Root()) {
+    while ((elm == nullptr || RB_IS_BLACK(elm)) && elm != head->Root() && parent != nullptr) {
        if (RB_LEFT(parent) == elm) {
            tmp = RB_RIGHT(parent);
            if (RB_IS_RED(tmp)) {