From 1b23e5471d0baddc96fd028c1a7ac3691e1fe7e4 Mon Sep 17 00:00:00 2001
From: Lior Stern <liorst4@gmail.com>
Date: Tue, 31 Mar 2020 17:03:13 +0300
Subject: [PATCH] check the value of nodeptr in tnode_t::source_range.

Avoids a possible nullptr dereference
---
 src/tnode.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/tnode.h b/src/tnode.h
index cfe3fd17b..ef2f59a1f 100644
--- a/src/tnode.h
+++ b/src/tnode.h
@@ -97,7 +97,7 @@ class tnode_t {
     uint8_t child_count() const { return nodeptr ? nodeptr->child_count : 0; }
 
     maybe_t<source_range_t> source_range() const {
-        if (nodeptr->source_start == NODE_OFFSET_INVALID) return none();
+        if (!nodeptr || nodeptr->source_start == NODE_OFFSET_INVALID) return none();
         return source_range_t{nodeptr->source_start, nodeptr->source_length};
     }