[gjs/gnome-3-24] arg: Avoid assigning out-of-range values

[Philip Chimento <pchimento src gnome org>]

commit 565161f038ad32e4c8f985f20d9dfd86cbca1435
Author: Philip Chimento <philip chimento gmail com>
Date:   Tue Aug 29 23:19:02 2017 -0700

    arg: Avoid assigning out-of-range values
    
    Assigning out-of-range values to variables of these types is undefined
    behaviour, and was caught by UBSan on Clang.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=786995

 gi/arg.cpp |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gi/arg.cpp b/gi/arg.cpp
index c961ebe..4b42550 100644
--- a/gi/arg.cpp
+++ b/gi/arg.cpp
@@ -1390,7 +1390,7 @@ gjs_value_to_g_argument(JSContext      *context,
             wrong = true;
         if (i > G_MAXUINT32 || i < 0)
             out_of_range = true;
-        arg->v_uint32 = (guint32)i;
+        arg->v_uint32 = CLAMP(i, 0, G_MAXUINT32);
         break;
     }
 
@@ -1411,7 +1411,7 @@ gjs_value_to_g_argument(JSContext      *context,
         if (v < 0)
             out_of_range = true;
         /* XXX we fail with values close to G_MAXUINT64 */
-        arg->v_uint64 = v;
+        arg->v_uint64 = MAX(v, 0);
     }
         break;