--- libgd-2.1.0/src/gd_gif_in.c.orig	2013-07-04 16:17:44.855925413 +0200
+++ libgd-2.1.0/src/gd_gif_in.c	2013-07-04 16:35:04.025881804 +0200
@@ -498,15 +498,16 @@ 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) {
+			if((count != 0) || (max_count < 0)) {
 				return -2;
 			}
 		}