diff -up gd-2.0.35/gd_gif_in.c.loop gd-2.0.35/gd_gif_in.c

--- gd-2.0.35/gd_gif_in.c.loop	2007-06-14 15:51:41.000000000 -0400

+++ gd-2.0.35/gd_gif_in.c	2008-07-21 11:20:25.000000000 -0400

@@ -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;