linux-kernel - [PATCH] wifi: rtw88: schedule rx work after everything is set up

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Date: Tue, 28 May 2024 13:02:46 +0200
From: Marcin Ślusarz <marcin.slusarz@...il.com>
To: linux-wireless@...r.kernel.org
Cc: Marcin Ślusarz <mslusarz@...au.com>,
	Tim K <tpkuester@...il.com>,
	Ping-Ke Shih <pkshih@...ltek.com>,
	Larry Finger <Larry.Finger@...inger.net>,
	Kalle Valo <kvalo@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] wifi: rtw88: schedule rx work after everything is set up

From: Marcin Ślusarz <mslusarz@...au.com>

Right now it's possible to hit NULL pointer dereference in
rtw_rx_fill_rx_status on hw object and/or its fields because
initialization routine can start getting USB replies before
rtw_dev is fully setup.

The stack trace looks like this:

rtw_rx_fill_rx_status
rtw8821c_query_rx_desc
rtw_usb_rx_handler
..
queue_work
rtw_usb_read_port_complete
..
usb_submit_urb
rtw_usb_rx_resubmit
rtw_usb_init_rx
rtw_usb_probe

So while we do the async stuff rtw_usb_probe continues and calls
rtw_register_hw, which does all kinds of initialization (e.g.
via ieee80211_register_hw) that rtw_rx_fill_rx_status relies on.

Fix this by moving the first usb_submit_urb after everything
is set up.

For me, this bug manifested as:
[    8.893177] rtw_8821cu 1-1:1.2: band wrong, packet dropped
[    8.910904] rtw_8821cu 1-1:1.2: hw->conf.chandef.chan NULL in rtw_rx_fill_rx_status
because I'm using Larry's backport of rtw88 driver with the NULL
checks in rtw_rx_fill_rx_status.

Reported-by: Tim K <tpkuester@...il.com>
Closes: https://lore.kernel.org/linux-wireless/CA+shoWQ7P49jhQasofDcTdQhiuarPTjYEDa--NiVVx494WcuQw@mail.gmail.com/
Signed-off-by: Marcin Ślusarz <mslusarz@...au.com>
Cc: Ping-Ke Shih <pkshih@...ltek.com>
Cc: Larry Finger <Larry.Finger@...inger.net>
Cc: Kalle Valo <kvalo@...nel.org>
Cc: linux-wireless@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
---
 drivers/net/wireless/realtek/rtw88/usb.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtw88/usb.c b/drivers/net/wireless/realtek/rtw88/usb.c
index a0188511099a..98f81e3ae13e 100644
--- a/drivers/net/wireless/realtek/rtw88/usb.c
+++ b/drivers/net/wireless/realtek/rtw88/usb.c
@@ -740,7 +740,6 @@ static struct rtw_hci_ops rtw_usb_ops = {
 static int rtw_usb_init_rx(struct rtw_dev *rtwdev)
 {
 	struct rtw_usb *rtwusb = rtw_get_usb_priv(rtwdev);
-	int i;

 	rtwusb->rxwq = create_singlethread_workqueue("rtw88_usb: rx wq");
 	if (!rtwusb->rxwq) {
@@ -752,13 +751,19 @@ static int rtw_usb_init_rx(struct rtw_dev *rtwdev)

 	INIT_WORK(&rtwusb->rx_work, rtw_usb_rx_handler);

+	return 0;
+}
+
+static void rtw_usb_setup_rx(struct rtw_dev *rtwdev)
+{
+	struct rtw_usb *rtwusb = rtw_get_usb_priv(rtwdev);
+	int i;
+
 	for (i = 0; i < RTW_USB_RXCB_NUM; i++) {
 		struct rx_usb_ctrl_block *rxcb = &rtwusb->rx_cb[i];

 		rtw_usb_rx_resubmit(rtwusb, rxcb);
 	}
-
-	return 0;
 }

 static void rtw_usb_deinit_rx(struct rtw_dev *rtwdev)
@@ -895,6 +900,8 @@ int rtw_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
 		goto err_destroy_rxwq;
 	}

+	rtw_usb_setup_rx(rtwdev);
+
 	return 0;

 err_destroy_rxwq:
-- 
2.25.1