File 0001-Fix-crash-bug-with-bad-GIFs-Issue-423.patch of Package htmldoc.17396

From f50aab7c7642467f2e7afbf7f04e186b30eeb1b9 Mon Sep 17 00:00:00 2001
From: Michael R Sweet <michael.r.sweet@gmail.com>
Date: Wed, 31 Mar 2021 20:18:00 -0400
Subject: [PATCH] Fix crash bug with bad GIFs (Issue #423)

---
 htmldoc/image.cxx | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/htmldoc/image.cxx b/htmldoc/image.cxx
index 5d29542..28777de 100644
--- a/htmldoc/image.cxx
+++ b/htmldoc/image.cxx
@@ -1271,6 +1271,9 @@ image_load_gif(image_t *img,	/* I - Image pointer */
   img->height = (buf[9] << 8) | buf[8];
   ncolors     = 2 << (buf[10] & 0x07);
 
+  if (img->width <= 0 || img->width > 32767 || img->height <= 0 || img->height > 32767)
+    return (-1);
+
   // If we are writing an encrypted PDF file, bump the use count so we create
   // an image object (Acrobat 6 bug workaround)
   if (Encryption)
-- 
2.31.1