linux-kernel - RE: [PATCH] usb: gadget: fsl_qe_udc: validate endpoint index for ch9 udc

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Message-ID: <AM0PR04MB628929736762F5DF46C55D708F24A@AM0PR04MB6289.eurprd04.prod.outlook.com>
Date:   Wed, 28 Jun 2023 21:10:01 +0000
From:   Leo Li <leoyang.li@....com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>,
        Ma Ke <make_ruc2021@....com>
CC:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] usb: gadget: fsl_qe_udc: validate endpoint index for ch9
 udc



> -----Original Message-----
> From: Christophe Leroy <christophe.leroy@...roup.eu>
> Sent: Wednesday, June 28, 2023 2:40 PM
> To: Leo Li <leoyang.li@....com>; Ma Ke <make_ruc2021@....com>
> Cc: gregkh@...uxfoundation.org; linux-usb@...r.kernel.org; linuxppc-
> dev@...ts.ozlabs.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH] usb: gadget: fsl_qe_udc: validate endpoint index for
> ch9 udc
> 
> 
> 
> Le 28/06/2023 à 19:04, Leo Li a écrit :
> >
> >
> >> -----Original Message-----
> >> From: Ma Ke <make_ruc2021@....com>
> >> Sent: Wednesday, June 28, 2023 3:15 AM
> >> To: Leo Li <leoyang.li@....com>
> >> Cc: gregkh@...uxfoundation.org; linux-usb@...r.kernel.org; linuxppc-
> >> dev@...ts.ozlabs.org; linux-kernel@...r.kernel.org; Ma Ke
> >> <make_ruc2021@....com>
> >> Subject: [PATCH] usb: gadget: fsl_qe_udc: validate endpoint index for
> >> ch9 udc
> >>
> >> We should verify the bound of the array to assure that host may not
> >> manipulate the index to point past endpoint array.
> >>
> >> Signed-off-by: Ma Ke <make_ruc2021@....com>
> >> ---
> >>   drivers/usb/gadget/udc/fsl_qe_udc.c | 2 ++
> >>   1 file changed, 2 insertions(+)
> >>
> >> diff --git a/drivers/usb/gadget/udc/fsl_qe_udc.c
> >> b/drivers/usb/gadget/udc/fsl_qe_udc.c
> >> index 3b1cc8fa30c8..f4e5cbd193b7 100644
> >> --- a/drivers/usb/gadget/udc/fsl_qe_udc.c
> >> +++ b/drivers/usb/gadget/udc/fsl_qe_udc.c
> >> @@ -1959,6 +1959,8 @@ static void ch9getstatus(struct qe_udc *udc, u8
> >> request_type, u16 value,
> >>   	} else if ((request_type & USB_RECIP_MASK) ==
> >> USB_RECIP_ENDPOINT) {
> >>   		/* Get endpoint status */
> >>   		int pipe = index & USB_ENDPOINT_NUMBER_MASK;
> >> +		if (pipe >= USB_MAX_ENDPOINTS)
> >> +			goto stall;
> >
> > Thanks.  This seems to be the right thing to do.  But normally we don't mix
> declarations with code within a code block.  Could we re-arrange the code a
> little bit so declarations stay on top?
> 
> But we are at the start of a code block aren't we ?

But they were at the beginning of a { } block which is compliant with the C89 standard.  I know gcc is more relaxed from this.  But it is probably still good to stick to the standard?

> 
> The only missing thing is the blank line between the declarations and the
> code, so that we clearly see where declarations end and where code start.
> 
> >
> >>   		struct qe_ep *target_ep = &udc->eps[pipe];
> >>   		u16 usep;
> >>
> >> --
> >> 2.37.2
> >