mac80211: mark station unauthorized before key removal

commit b16798f5b907733966fd1a558fca823b3c67e4a1 upstream.

If a station is still marked as authorized, mark it as no longer
so before removing its keys. This allows frames transmitted to it
to be rejected, providing additional protection against leaking
plain text data during the disconnection flow.

Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20200326155133.ccb4fb0bb356.If48f0f0504efdcf16b8921f48c6d3bb2cb763c99@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index c800bc7c517630f96fb4b5bf436a436b3cc3dd75..4f7061c3b770690291e0ce105d3e1ef09baf83f1 100644 (file)
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -3,6 +3,7 @@
  * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
  * Copyright 2013-2014  Intel Mobile Communications GmbH
  * Copyright (C) 2015 - 2016 Intel Deutschland GmbH
+ * Copyright (C) 2018-2020 Intel Corporation
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -945,6 +946,11 @@ static void __sta_info_destroy_part2(struct sta_info *sta)
        might_sleep();
        lockdep_assert_held(&local->sta_mtx);
 
+       while (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
+               ret = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
+               WARN_ON_ONCE(ret);
+       }
+
        /* now keys can no longer be reached */
        ieee80211_free_sta_keys(local, sta);