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From:   Felix Fietkau <nbd@nbd.name>
To:     linux-wireless@vger.kernel.org
Cc:     johannes@sipsolutions.net,
        Sebastian Gottschall <s.gottschall@dd-wrt.com>
Subject: [PATCH] mac80211: do not drop tx nulldata packets on encrypted links
Date:   Fri, 18 Dec 2020 20:15:25 +0100
Message-Id: <20201218191525.1168-1-nbd@nbd.name>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

ieee80211_tx_h_select_key drops any non-mgmt packets without a key when
encryption is used. This is wrong for nulldata packets that can't be
encrypted and are sent out for probing clients and indicating 4-address
mode.

Reported-by: Sebastian Gottschall <s.gottschall@dd-wrt.com>
Fixes: a0761a301746 ("mac80211: drop data frames without key on encrypted links")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 net/mac80211/tx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 39c7059c644f..b728a9507a87 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -649,7 +649,7 @@ ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
 		if (!skip_hw && tx->key &&
 		    tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
 			info->control.hw_key = &tx->key->conf;
-	} else if (!ieee80211_is_mgmt(hdr->frame_control) && tx->sta &&
+	} else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta &&
 		   test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) {
 		return TX_DROP;
 	}
-- 
2.28.0