From: Greg KH <gregkh@linuxfoundation.org>
To: Chris Wulff <Chris.Wulff@biamp.com>
Cc: "linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>
Subject: Re: [PATCH] usb: gadget: f_fs: Fix a race condition when processing setup packets.
Date: Thu, 18 Apr 2024 16:38:41 +0200 [thread overview]
Message-ID: <2024041824-frigidly-barrack-ca97@gregkh> (raw)
In-Reply-To: <CO1PR17MB54192FDB6988F5C4F5C4E41DE1082@CO1PR17MB5419.namprd17.prod.outlook.com>
On Tue, Apr 16, 2024 at 07:28:27PM +0000, Chris Wulff wrote:
>
> If the USB driver passes a pointer into the TRB buffer for creq, this
> buffer can be overwritten with the status response as soon as the event
> is queued. This can make the final check return USB_GADGET_DELAYED_STATUS
> when it shouldn't. Instead use the stored wLength.
> ---
> drivers/usb/gadget/function/f_fs.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
> index bffbc1dc651f..8d72acf9a760 100644
> --- a/drivers/usb/gadget/function/f_fs.c
> +++ b/drivers/usb/gadget/function/f_fs.c
> @@ -3803,7 +3803,7 @@ static int ffs_func_setup(struct usb_function *f,
> __ffs_event_add(ffs, FUNCTIONFS_SETUP);
> spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags);
>
> - return creq->wLength == 0 ? USB_GADGET_DELAYED_STATUS : 0;
> + return ffs->ev.setup.wLength == 0 ? USB_GADGET_DELAYED_STATUS : 0;
> }
>
> static bool ffs_func_req_match(struct usb_function *f,
> --
> 2.34.1
>
>
Hi,
This is the friendly patch-bot of Greg Kroah-Hartman. You have sent him
a patch that has triggered this response. He used to manually respond
to these common problems, but in order to save his sanity (he kept
writing the same thing over and over, yet to different people), I was
created. Hopefully you will not take offence and will fix the problem
in your patch and resubmit it so that it can be accepted into the Linux
kernel tree.
You are receiving this message because of the following common error(s)
as indicated below:
- Your patch does not have a Signed-off-by: line. Please read the
kernel file, Documentation/process/submitting-patches.rst and resend
it after adding that line. Note, the line needs to be in the body of
the email, before the patch, not at the bottom of the patch or in the
email signature.
If you wish to discuss this problem further, or you have questions about
how to resolve this issue, please feel free to respond to this email and
Greg will reply once he has dug out from the pending patches received
from other developers.
thanks,
greg k-h's patch email bot
prev parent reply other threads:[~2024-04-18 14:38 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-16 19:28 [PATCH] usb: gadget: f_fs: Fix a race condition when processing setup packets Chris Wulff
2024-04-18 14:38 ` Greg KH [this message]
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