Fix Savannah bug #30247.

* src/pcf/pcfread.c (pcf_get_metrics): Disallow (invalid) fonts with
zero metrics.

ChangeLog

@@ -1,3 +1,10 @@
+2010-06-24  Werner Lemberg  <wl@gnu.org>
+
+	Fix Savannah bug #30247.
+
+	* src/pcf/pcfread.c (pcf_get_metrics): Disallow (invalid) fonts with
+	zero metrics.
+
 2010-06-24  Graham Asher  <graham.asher@btinternet.com>
 
 	* src/smooth/ftgrays.c (gray_render_cubic): Fix algorithm.

src/pcf/pcfread.c

@@ -2,7 +2,8 @@
 
     FreeType font driver for pcf fonts
 
-  Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 by
+  Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
+            2010 by
   Francesco Zappa Nardelli
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
@@ -607,6 +608,9 @@ THE SOFTWARE.
 
     face->nmetrics = nmetrics;
 
+    if ( !nmetrics )
+      return PCF_Err_Invalid_Table;
+
     FT_TRACE4(( "pcf_get_metrics:\n" ));
 
     FT_TRACE4(( "  number of metrics: %d\n", nmetrics ));