linux-kernel - Re: [PATCH V2] wifi: ath6kl: Replace ath6kl_usb_submit_ctrl_in with usb_control_msg

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Message-ID: <tencent_2C2C336C9E441B294BB21B6A2558BA34BB08@qq.com>
Date: Mon, 26 Aug 2024 19:12:54 +0800
From: Edward Adam Davis <eadavis@...com>
To: gregkh@...uxfoundation.org
Cc: sergei.shtylyov@...il.com,
	eadavis@...com,
	kvalo@...nel.org,
	linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org,
	linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org,
	syzbot+92c6dd14aaa230be6855@...kaller.appspotmail.com,
	syzkaller-bugs@...glegroups.com
Subject: Re: [PATCH V2] wifi: ath6kl: Replace ath6kl_usb_submit_ctrl_in with usb_control_msg_recv

Hi Greg KH and Sergey,

On Mon, 26 Aug 2024 07:04:00 +0200, Greg KH wrote:
> > ath6kl_usb_submit_ctrl_in() did not take into account the situation where
> > the length of the data read from the device is not equal to the len, and
> > such missing judgments will result in subsequent code using incorrect data.
> >
> > usb_control_msg_recv() handles the abnormal length of the returned data,
> > so using it directly can fix this warning.
> >
> > Reported-by: syzbot+92c6dd14aaa230be6855@...kaller.appspotmail.com
> > Signed-off-by: Edward Adam Davis <eadavis@...com>
> > ---
> > V2: Directly using USB functions
> >
> >  drivers/net/wireless/ath/ath6kl/usb.c | 6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/net/wireless/ath/ath6kl/usb.c b/drivers/net/wireless/ath/ath6kl/usb.c
> > index 5220809841a6..dc1f89ebb740 100644
> > --- a/drivers/net/wireless/ath/ath6kl/usb.c
> > +++ b/drivers/net/wireless/ath/ath6kl/usb.c
> > @@ -1027,9 +1027,9 @@ static int ath6kl_usb_bmi_read(struct ath6kl *ar, u8 *buf, u32 len)
> >  	int ret;
> >
> >  	/* get response */
> > -	ret = ath6kl_usb_submit_ctrl_in(ar_usb,
> > -					ATH6KL_USB_CONTROL_REQ_RECV_BMI_RESP,
> > -					0, 0, buf, len);
> 
> By removing this call, there is now only one call left to
> ath6kl_usb_submit_ctrl_in(), so that probably can also be unwrapped in a
> second patch in this series, right?
Sorry, I didn't clarify what you said.
> 
> > +	ret = usb_control_msg_recv(ar_usb->udev, 0, ATH6KL_USB_CONTROL_REQ_RECV_BMI_RESP,
> > +				 USB_DIR_IN | USB_TYPE_VENDOR |
> > +				 USB_RECIP_DEVICE, 0, 0, buf, len, 2000, GFP_KERNEL);
> 
> As was pointed out, this is a very odd indentation style.
I will send V3 patch to adjust the indentation style.

BR,
Edward