From 078f6cd3acacacf97f3df7758a8136c24ebc7952 Mon Sep 17 00:00:00 2001
From: Rich Geldreich <richgel99@gmail.com>
Date: Fri, 20 Mar 2020 02:27:33 -0400
Subject: [PATCH] Adding null pointer check here for safety

---
 lodepng.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lodepng.cpp b/lodepng.cpp
index 60ad5ff..63adcf4 100644
--- a/lodepng.cpp
+++ b/lodepng.cpp
@@ -201,6 +201,7 @@ static void uivector_init(uivector* p) {
 /*returns 1 if success, 0 if failure ==> nothing done*/
 static unsigned uivector_push_back(uivector* p, unsigned c) {
   if(!uivector_resize(p, p->size + 1)) return 0;
+  if (!p->data) return 0;
   p->data[p->size - 1] = c;
   return 1;
 }