This is a note to let you know that I've just added the patch titled
wifi: rtw88: usb: schedule rx work after everything is set up
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
wifi-rtw88-usb-schedule-rx-work-after-everything-is-.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit fb05e937116020259a9346d6da17144709d51b08
Author: Marcin Ślusarz <mslusarz@xxxxxxxxx>
Date: Tue May 28 13:02:46 2024 +0200
wifi: rtw88: usb: schedule rx work after everything is set up
[ Upstream commit adc539784c98a7cc602cbf557debfc2e7b9be8b3 ]
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.
Link: https://lore.kernel.org/linux-wireless/CA+shoWQ7P49jhQasofDcTdQhiuarPTjYEDa--NiVVx494WcuQw@xxxxxxxxxxxxxx/
Signed-off-by: Marcin Ślusarz <mslusarz@xxxxxxxxx>
Cc: Tim K <tpkuester@xxxxxxxxx>
Cc: Ping-Ke Shih <pkshih@xxxxxxxxxxx>
Cc: Larry Finger <Larry.Finger@xxxxxxxxxxxx>
Cc: Kalle Valo <kvalo@xxxxxxxxxx>
Cc: linux-wireless@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Ping-Ke Shih <pkshih@xxxxxxxxxxx>
Link: https://patch.msgid.link/20240528110246.477321-1-marcin.slusarz@xxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/wireless/realtek/rtw88/usb.c b/drivers/net/wireless/realtek/rtw88/usb.c
index efd0c2915a05..04a64afcbf8a 100644
--- a/drivers/net/wireless/realtek/rtw88/usb.c
+++ b/drivers/net/wireless/realtek/rtw88/usb.c
@@ -742,7 +742,6 @@ 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) {
@@ -754,13 +753,19 @@ 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)
@@ -897,6 +902,8 @@ 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:
