[glib: 1/2] gthreadedresolver: Fix logic in parse_res_text()

[Philip Withnall <pwithnall src gnome org>]

commit a3b5e188aa70ad57b119b2b24f94a4d639174bab
Author: Peter Bloomfield <PeterBloomfield bellsouth net>
Date:   Sat Sep 26 11:11:44 2020 -0400

    gthreadedresolver: Fix logic in parse_res_text()
    
    and avoid a sign-compare warning.
    
    Fixes #2209

 gio/gthreadedresolver.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gio/gthreadedresolver.c b/gio/gthreadedresolver.c
index 48435b36f..d170c73a9 100644
--- a/gio/gthreadedresolver.c
+++ b/gio/gthreadedresolver.c
@@ -620,7 +620,7 @@ parse_res_txt (guchar  *answer,
   while (at < end)
     {
       len = *(at++);
-      if (len > at - end)
+      if (len > (gsize) (end - at))
         break;
       g_ptr_array_add (array, g_strndup ((gchar *)at, len));
       at += len;