--- gd-2.0.35/gd_gif_in.c	2007-06-14 21:51:41.000000000 +0200
+++ gd-2.0.35/gd_gif_in.c.loop	2008-10-25 11:51:59.000000000 +0200
@@ -453,16 +453,17 @@ LWZReadByte_(gdIOCtx *fd, LZW_STATIC_DAT
                        return sd->firstcode;
                } else if (code == sd->end_code) {
                        int             count;
+                       int             max_count = 1024;
                        unsigned char   buf[260];
 
                        if (*ZeroDataBlockP)
                                return -2;
 
-                       while ((count = GetDataBlock(fd, buf, ZeroDataBlockP)) > 0)
+                       while ((count = GetDataBlock(fd, buf, ZeroDataBlockP)) > 0 && --max_count >= 0 )
                                ;
 
-                       if (count != 0)
-                       return -2;
+                       if (count != 0 || max_count < 0 )
+                               return -2;
                }
 
                incode = code;