linux-kernel - Re: [PATCH] usb: dwc3: gadget: Fail request submission if it was already queued

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Date:   Fri, 11 Jan 2019 09:43:41 +0200
From:   Felipe Balbi <balbi@...nel.org>
To:     Manu Gautam <mgautam@...eaurora.org>
Cc:     linux-arm-msm@...r.kernel.org,
        Manu Gautam <mgautam@...eaurora.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "open list\:DESIGNWARE USB3 DRD IP DRIVER" 
        <linux-usb@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: dwc3: gadget: Fail request submission if it was already queued


Hi,

Manu Gautam <mgautam@...eaurora.org> writes:
> If a function driver tries to re-submit an already queued request,
> it can results in corruption of pending/started request lists.
> Catch such conditions and fail the request submission to DCD.
>
> Signed-off-by: Manu Gautam <mgautam@...eaurora.org>
> ---
>  drivers/usb/dwc3/gadget.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
> index 679c12e14522..51716c6b286a 100644
> --- a/drivers/usb/dwc3/gadget.c
> +++ b/drivers/usb/dwc3/gadget.c
> @@ -1290,6 +1290,12 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
>  				&req->request, req->dep->name))
>  		return -EINVAL;
>  
> +	if (req->request.status == -EINPROGRESS) {

this test is really not enough. What if gadget driver set status to
EINPROGRESS before submission? A better check would involve making sure
req isn't part of dep->pending_list or dep->started_list or
dep->cancelled_list. It's clear that this won't work very well as the
amount of requests grow.

Anyway, which gadget driver did this? Why is it only affecting dwc3?

-- 
balbi

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