linux-kernel - Re: [PATCH] input: cm109: fix URB submitted while active

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Message-ID: <19948c76-fa3c-26bb-7604-6de392ad9d49@gmail.com>
Date:   Wed, 18 Aug 2021 14:07:44 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     dmitry.torokhov@...il.com, aeh@...org
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzbot+2d6d691af5ab4b7e66df@...kaller.appspotmail.com
Subject: Re: [PATCH] input: cm109: fix URB submitted while active

On 8/4/21 5:58 PM, Pavel Skripkin wrote:
> Syzbot reported, that dev->urb_ctl was submitted while active. The
> problem was in missing validation check. We should check, that dev->urb_ctl
> is not pending before sumbitting it again.
> 
> Fail log:
> 
> URB 00000000cfeee59c submitted while active
> WARNING: CPU: 1 PID: 8459 at drivers/usb/core/urb.c:378 usb_submit_urb+0x1271/0x1540 drivers/usb/core/urb.c:378
> ...
> Call Trace:
>   <IRQ>
>   cm109_urb_irq_callback+0x44f/0xaa0 drivers/input/misc/cm109.c:422
>   __usb_hcd_giveback_urb+0x2b0/0x5c0 drivers/usb/core/hcd.c:1656
>   usb_hcd_giveback_urb+0x367/0x410 drivers/usb/core/hcd.c:1726
> 
> Reported-and-tested-by: syzbot+2d6d691af5ab4b7e66df@...kaller.appspotmail.com
> Fixes: c04148f915e5 ("Input: add driver for USB VoIP phones with CM109 chipset")
> Signed-off-by: Pavel Skripkin <paskripkin@...il.com>
> ---


Gentle ping :)



With regards,
Pavel Skripkin

>   drivers/input/misc/cm109.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/input/misc/cm109.c b/drivers/input/misc/cm109.c
> index f515fae465c3..60bddadbbe3a 100644
> --- a/drivers/input/misc/cm109.c
> +++ b/drivers/input/misc/cm109.c
> @@ -406,7 +406,7 @@ static void cm109_urb_irq_callback(struct urb *urb)
>   
>   	dev->irq_urb_pending = 0;
>   
> -	if (likely(!dev->shutdown)) {
> +	if (likely(!dev->shutdown) && likely(!dev->ctl_urb_pending)) {
>   
>   		if (dev->buzzer_state)
>   			dev->ctl_data->byte[HID_OR0] |= BUZZER_ON;
>