linux-kernel - [PATCH 5.4 31/33] mac80211: do not drop tx nulldata packets on encrypted links

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Message-Id: <20210122135734.824968810@linuxfoundation.org>
Date:   Fri, 22 Jan 2021 15:12:47 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Sebastian Gottschall <s.gottschall@...wrt.com>,
        Felix Fietkau <nbd@....name>,
        Johannes Berg <johannes.berg@...el.com>
Subject: [PATCH 5.4 31/33] mac80211: do not drop tx nulldata packets on encrypted links

From: Felix Fietkau <nbd@....name>

commit 2463ec86cd0338a2c2edbfb0b9d50c52ff76ff43 upstream.

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@...wrt.com>
Fixes: a0761a301746 ("mac80211: drop data frames without key on encrypted links")
Signed-off-by: Felix Fietkau <nbd@....name>
Link: https://lore.kernel.org/r/20201218191525.1168-1-nbd@nbd.name
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/mac80211/tx.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -657,7 +657,7 @@ ieee80211_tx_h_select_key(struct ieee802
 		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;
 	}