Copied from Fedora.

http://pkgs.fedoraproject.org/cgit/libwmf.git/tree/libwmf-0.2.8.4-CVE-2007-0455.patch

--- libwmf-0.2.8.4/src/extra/gd/gdft.c	2010-12-06 11:18:26.000000000 +0000
+++ libwmf-0.2.8.4/src/extra/gd/gdft.c	2010-12-06 11:21:09.000000000 +0000
@@ -811,7 +811,7 @@
 	    {
 	      ch = c & 0xFF;	/* don't extend sign */
 	    }
-	  next++;
+	  if (*next) next++;
 	}
       else
 	{
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