From 800a684d6d3cae7ed2437a23496d9306c0dfa8dc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jaroslav=20Loba=C4=8Devski?= <jarlob@github.com>
Date: Thu, 19 Oct 2023 16:33:06 +0200
Subject: [PATCH] Fix Null pointer dereference because of an uninitialized
 variable

Call `stbi__vertical_flip_slices` only if the previous function didn't fail. Fixes #1550
---
 stb_image.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/stb_image.h b/stb_image.h
index 49c53d0..de12c06 100644
--- a/stb_image.h
+++ b/stb_image.h
@@ -1446,7 +1446,7 @@ STBIDEF stbi_uc *stbi_load_gif_from_memory(stbi_uc const *buffer, int len, int *
    stbi__start_mem(&s,buffer,len);
 
    result = (unsigned char*) stbi__load_gif_main(&s, delays, x, y, z, comp, req_comp);
-   if (stbi__vertically_flip_on_load) {
+   if (stbi__vertically_flip_on_load && result) {
       int channels = req_comp ? req_comp : *comp;
       stbi__vertical_flip_slices( result, *x, *y, *z, channels );
    }
-- 
2.41.0