From 4c830d4862461b5d0b086289b251b850884cbd57 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <icculus@icculus.org>
Date: Sat, 27 Jan 2018 23:28:09 -0500
Subject: [PATCH] gif: report error on bogus LWZ data, instead of overflowing a
 buffer.

---
 IMG_gif.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/IMG_gif.c b/IMG_gif.c
index ac3d7abb..c731cf29 100755
--- a/IMG_gif.c
+++ b/IMG_gif.c
@@ -497,8 +497,10 @@ LWZReadByte(SDL_RWops *src, int flag, int input_code_size)
             return -3;
         }
         *sp++ = table[1][code];
-        if (code == table[0][code])
-        RWSetMsg("circular table entry BIG ERROR");
+        if (code == table[0][code]) {
+            RWSetMsg("circular table entry BIG ERROR");
+            return -3;
+        }
         code = table[0][code];
     }