Avoid overflow in freetype/font_context.rs

servo · Nov 16, 2015 · 7cbef87 · 7cbef87
1 parent f8c2c3c
commit 7cbef87
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/components/gfx/platform/freetype/font_context.rs b/components/gfx/platform/freetype/font_context.rs
@@ -57,7 +57,8 @@ extern fn ft_realloc(mem: FT_Memory, _cur_size: c_long, new_req_size: c_long,
         let new_actual_size = heap_size_of(new_ptr);
 
         let user = (*mem).user as *mut User;
-        (*user).size += new_actual_size - old_actual_size;
+        (*user).size += new_actual_size;
+        (*user).size -= old_actual_size;
 
         new_ptr
     }