[sfnt] Fix Savannah bug #43597.

* src/sfnt/pngshim.c (Load_SBit_Png): Protect against too large
bitmaps.

ChangeLog

@@ -1,3 +1,10 @@
+2014-11-15  Werner Lemberg  <wl@gnu.org>
+
+	[sfnt] Fix Savannah bug #43597.
+
+	* src/sfnt/pngshim.c (Load_SBit_Png): Protect against too large
+	bitmaps.
+
 2014-11-12  Werner Lemberg  <wl@gnu.org>
 
 	[sfnt] Fix Savannah bug #43591.

src/sfnt/pngshim.c

@@ -269,6 +269,13 @@
       map->pitch      = map->width * 4;
       map->num_grays  = 256;
 
+      /* reject too large bitmaps similarly to the rasterizer */
+      if ( map->rows > 0x7FFF || map->width > 0x7FFF )
+      {
+        error = FT_THROW( Array_Too_Large );
+        goto DestroyExit;
+      }
+
       size = map->rows * map->pitch;
 
       error = ft_glyphslot_alloc_bitmap( slot, size );