[glib/glib-2-66: 2/4] gkeyfilesettingsbackend: Disallow empty key or group names

[Sebastian Dröge <sdroege src gnome org>]

commit 31e0d403ba635dbbacbfbff74295e5db02558d76
Author: Philip Withnall <pwithnall endlessos org>
Date:   Wed Feb 10 21:19:30 2021 +0000

    gkeyfilesettingsbackend: Disallow empty key or group names
    
    These should never have been allowed; they will result in precondition
    failures from the `GKeyFile` later on in the code.
    
    A test will be added for this shortly.
    
    Signed-off-by: Philip Withnall <pwithnall endlessos org>

 gio/gkeyfilesettingsbackend.c | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/gio/gkeyfilesettingsbackend.c b/gio/gkeyfilesettingsbackend.c
index 861c3a661..de216e615 100644
--- a/gio/gkeyfilesettingsbackend.c
+++ b/gio/gkeyfilesettingsbackend.c
@@ -158,6 +158,13 @@ convert_path (GKeyfileSettingsBackend  *kfsb,
 
   last_slash = strrchr (key, '/');
 
+  /* Disallow empty group names or key names */
+  if (key_len == 0 ||
+      (last_slash != NULL &&
+       (*(last_slash + 1) == '\0' ||
+        last_slash == key)))
+    return FALSE;
+
   if (kfsb->root_group)
     {
       /* if a root_group was specified, make sure the user hasn't given