[base] Integer overflow.

Reported as

  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2573

* src/base/ftobjs.c (ft_glyphslot_grid_fit_metrics): Use
FT_PIX_CEIL_LONG and FT_PIX_ROUND_LONG.

ChangeLog

@@ -1,3 +1,14 @@
+2017-07-12  Werner Lemberg  <wl@gnu.org>
+
+	[base] Integer overflow.
+
+	Reported as
+
+	  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2573
+
+	* src/base/ftobjs.c (ft_glyphslot_grid_fit_metrics): Use
+	FT_PIX_CEIL_LONG and FT_PIX_ROUND_LONG.
+
 2017-07-12  Werner Lemberg  <wl@gnu.org>
 
 	* src/truetype/ttpload.c (tt_face_get_location): Off-by-one typo.

src/base/ftobjs.c

@@ -579,12 +579,12 @@
     if ( vertical )
     {
       metrics->horiBearingX = FT_PIX_FLOOR( metrics->horiBearingX );
-      metrics->horiBearingY = FT_PIX_CEIL ( metrics->horiBearingY );
+      metrics->horiBearingY = FT_PIX_CEIL_LONG( metrics->horiBearingY );
 
-      right  = FT_PIX_CEIL( ADD_LONG( metrics->vertBearingX,
-                                      metrics->width ) );
-      bottom = FT_PIX_CEIL( ADD_LONG( metrics->vertBearingY,
-                                      metrics->height ) );
+      right  = FT_PIX_CEIL_LONG( ADD_LONG( metrics->vertBearingX,
+                                           metrics->width ) );
+      bottom = FT_PIX_CEIL_LONG( ADD_LONG( metrics->vertBearingY,
+                                           metrics->height ) );
 
       metrics->vertBearingX = FT_PIX_FLOOR( metrics->vertBearingX );
       metrics->vertBearingY = FT_PIX_FLOOR( metrics->vertBearingY );
@@ -599,13 +599,13 @@
       metrics->vertBearingX = FT_PIX_FLOOR( metrics->vertBearingX );
       metrics->vertBearingY = FT_PIX_FLOOR( metrics->vertBearingY );
 
-      right  = FT_PIX_CEIL ( ADD_LONG( metrics->horiBearingX,
-                                       metrics->width ) );
+      right  = FT_PIX_CEIL_LONG( ADD_LONG( metrics->horiBearingX,
+                                           metrics->width ) );
       bottom = FT_PIX_FLOOR( SUB_LONG( metrics->horiBearingY,
                                        metrics->height ) );
 
       metrics->horiBearingX = FT_PIX_FLOOR( metrics->horiBearingX );
-      metrics->horiBearingY = FT_PIX_CEIL ( metrics->horiBearingY );
+      metrics->horiBearingY = FT_PIX_CEIL_LONG( metrics->horiBearingY );
 
       metrics->width  = SUB_LONG( right,
                                   metrics->horiBearingX );
@@ -613,8 +613,8 @@
                                   bottom );
     }
 
-    metrics->horiAdvance = FT_PIX_ROUND( metrics->horiAdvance );
-    metrics->vertAdvance = FT_PIX_ROUND( metrics->vertAdvance );
+    metrics->horiAdvance = FT_PIX_ROUND_LONG( metrics->horiAdvance );
+    metrics->vertAdvance = FT_PIX_ROUND_LONG( metrics->vertAdvance );
   }
 #endif /* GRID_FIT_METRICS */