[PATCH 4.19 037/306] mt76: do not store aggregation sequence number for null-data frames

[Greg Kroah-Hartman]

From: Felix Fietkau <nbd@xxxxxxxx>

[ Upstream commit 5155938d8a0fe0e0251435cae02539e81fb8e407 ]

Fixes a rare corner case where a BlockAckReq might get the wrong
sequence number.

Signed-off-by: Felix Fietkau <nbd@xxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/net/wireless/mediatek/mt76/tx.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/tx.c b/drivers/net/wireless/mediatek/mt76/tx.c
index 20447fdce4c33..227e5ebfe3dc2 100644
--- a/drivers/net/wireless/mediatek/mt76/tx.c
+++ b/drivers/net/wireless/mediatek/mt76/tx.c
@@ -148,7 +148,8 @@ mt76_check_agg_ssn(struct mt76_txq *mtxq, struct sk_buff *skb)
 {
 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 
-	if (!ieee80211_is_data_qos(hdr->frame_control))
+	if (!ieee80211_is_data_qos(hdr->frame_control) ||
+	    !ieee80211_is_data_present(hdr->frame_control))
 		return;
 
 	mtxq->agg_ssn = le16_to_cpu(hdr->seq_ctrl) + 0x10;
-- 
2.20.1