From: Felix Fietkau <nbd@nbd.name>
Date: Tue, 15 May 2018 12:33:23 +0000 (+0200)
Subject: mt76: discard early received packets if not running yet
X-Git-Tag: v4.18-rc1~114^2~67^2~51
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=66a77cbe63eb326513632cc88e1260e877be8123;p=thirdparty%2Fkernel%2Flinux.git

mt76: discard early received packets if not running yet

If the radio was previously in running state, it can receive some
packets before it is able to process them.
This can lead to a crash if the channel is not initialized yet.
Discard all rx packets until start() is called

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
---

diff --git a/drivers/net/wireless/mediatek/mt76/mt76x2_mac.c b/drivers/net/wireless/mediatek/mt76/mt76x2_mac.c
index dab7137560044..b49aea4da2d66 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x2_mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x2_mac.c
@@ -301,6 +301,9 @@ int mt76x2_mac_process_rx(struct mt76x2_dev *dev, struct sk_buff *skb,
 	u8 wcid;
 	int len;
 
+	if (!test_bit(MT76_STATE_RUNNING, &dev->mt76.state))
+		return -EINVAL;
+
 	if (rxinfo & MT_RXINFO_L2PAD)
 		pad_len += 2;