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mac80211: mark station unauthorized before key removal

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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>
This commit is contained in:
Johannes Berg 2020-03-26 15:51:35 +01:00
parent ce2e1ca703
commit b16798f5b9
1 changed files with 6 additions and 1 deletions
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7
net/mac80211/sta_info.c
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@ -4,7 +4,7 @@
* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
* Copyright 2013-2014 Intel Mobile Communications GmbH
* Copyright (C) 2015 - 2017 Intel Deutschland GmbH
* Copyright (C) 2018-2019 Intel Corporation
* Copyright (C) 2018-2020 Intel Corporation
*/
#include <linux/module.h>
@ -1049,6 +1049,11 @@ 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);