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

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Date: Tue, 28 May 2024 02:50:50 +0000
From: Ping-Ke Shih <pkshih@...ltek.com>
To: Kalle Valo <kvalo@...nel.org>,
        "marcin.slusarz@...il.com"
	<marcin.slusarz@...il.com>
CC: "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        Marcin Ślusarz <mslusarz@...au.com>,
        Larry Finger
	<Larry.Finger@...inger.net>,
        "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] wifi: rtw88: schedule rx work after everything is set up

Kalle Valo <kvalo@...nel.org> wrote:
> marcin.slusarz@...il.com writes:
> 
> > 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.
> >
> > This should fix:
> > https://marc.info/?l=linux-wireless&m=167907688311943&w=2
> 
> Please use permalinks from lore.kernel.org, marc links don't contain the
> Message-Id and are hence unreliable.
> 

Use tags below: 

Reported-by: Tim K <tpkuester@...il.com>
Closes: https://lore.kernel.org/linux-wireless/CA+shoWQ7P49jhQasofDcTdQhiuarPTjYEDa--NiVVx494WcuQw@mail.gmail.com/