Fix more 32bit issues (#54208)

* src/cff/cffload.c (cff_blend_build_vector): Convert assertion into
run-time error.

* src/truetype/ttgxvar.c (ft_var_to_normalized): Protect against
numeric overflow.

ChangeLog

@@ -1,3 +1,13 @@
+2018-07-05  Werner Lemberg  <wl@gnu.org>
+
+	Fix more 32bit issues (#54208)
+
+	* src/cff/cffload.c (cff_blend_build_vector): Convert assertion into
+	run-time error.
+
+	* src/truetype/ttgxvar.c (ft_var_to_normalized): Protect against
+	numeric overflow.
+
 2018-07-04  Werner Lemberg  <wl@gnu.org>
 
 	Fix 32bit build warnings (#54239).

src/cff/cffload.c

@@ -1398,7 +1398,14 @@
     FT_UInt       master;
 
 
-    FT_ASSERT( lenNDV == 0 || NDV );
+    /* protect against malformed fonts */
+    if ( !( lenNDV == 0 || NDV ) )
+    {
+      FT_TRACE4(( " cff_blend_build_vector:"
+                  " Malformed Normalize Design Vector data\n" ));
+      error = FT_THROW( Invalid_File_Format );
+      goto Exit;
+    }
 
     blend->builtBV = FALSE;
 

src/truetype/ttgxvar.c

@@ -1780,11 +1780,11 @@
       }
 
       if ( coord < a->def )
-        normalized[i] = -FT_DivFix( coord - a->def,
-                                    a->minimum - a->def );
+        normalized[i] = -FT_DivFix( SUB_LONG( coord, a->def ),
+                                    SUB_LONG( a->minimum, a->def ) );
       else if ( coord > a->def )
-        normalized[i] = FT_DivFix( coord - a->def,
-                                   a->maximum - a->def );
+        normalized[i] = FT_DivFix( SUB_LONG( coord, a->def ),
+                                   SUB_LONG( a->maximum, a->def ) );
       else
         normalized[i] = 0;
     }