Kees Cook from Ubuntu reported a "off-the-end-of-string increment", which could
theoretically lead ot a buffer overflow.

This flaw would only be exploitable if a JIS-encoded font is used when
processing a special malicious string.

The issue here is that the NULL terminator is incremented, which could lead to
unknown results during the processing of the malicious string.

Index: gdft.c
===================================================================
RCS file: /repository/gd/libgd/gdft.c,v
retrieving revision 1.28
diff -u -p -r1.28 gdft.c
--- gdft.c      3 Jan 2007 21:21:21 -0000       1.28
+++ gdft.c      24 Jan 2007 23:00:55 -0000
@@ -1178,7 +1178,7 @@ fprintf(stderr,"dpi=%d,%d metric_res=%d 
                {
                  ch = c & 0xFF;        /* don't extend sign */
                }
-             next++;
+             if (*next) next++;
            }
            break;
          case gdFTEX_Big5: