Copied from Debian

Description: Buffer overflow in gif2tiff
Bug: http://bugzilla.maptools.org/show_bug.cgi?id=2450
Bug-Debian: http://bugs.debian.org/719303

Index: tiff-4.0.3/tools/gif2tiff.c
===================================================================
--- tiff-4.0.3.orig/tools/gif2tiff.c	2013-08-22 11:46:11.960846910 -0400
+++ tiff-4.0.3/tools/gif2tiff.c	2013-08-22 11:46:11.956846910 -0400
@@ -333,6 +333,8 @@
     int status = 1;
 
     datasize = getc(infile);
+    if (datasize > 12)
+	return 0;
     clear = 1 << datasize;
     eoi = clear + 1;
     avail = clear + 2;