linux-kernel - Re: [PATCH] usb: core: urb: change a dev_WARN() to dev

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Date:   Fri, 31 Jan 2020 16:39:07 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Johan Hovold <johan@...nel.org>
Cc:     gregkh@...uxfoundation.org, Alan Stern <stern@...land.harvard.edu>,
        syzbot <syzbot+1bc2c2afd44f820a669f@...kaller.appspotmail.com>,
        andreyknvl@...gle.com, ingrassia@...genesys.com,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [PATCH] usb: core: urb: change a dev_WARN() to dev_err() for
 syzbot

On Fri, Jan 31, 2020 at 02:30:04PM +0100, Johan Hovold wrote:
> > Reported-by: syzbot+1bc2c2afd44f820a669f@...kaller.appspotmail.com
> > Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> > ---
> > 
> >  drivers/usb/core/urb.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c
> > index da923ec17612..0980c1d2253d 100644
> > --- a/drivers/usb/core/urb.c
> > +++ b/drivers/usb/core/urb.c
> > @@ -475,7 +475,7 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
> >  
> >  	/* Check that the pipe's type matches the endpoint's type */
> >  	if (usb_urb_ep_type_check(urb))
> > -		dev_WARN(&dev->dev, "BOGUS urb xfer, pipe %x != type %x\n",
> > +		dev_err(&dev->dev, "BOGUS urb xfer, pipe %x != type %x\n",
> >  			usb_pipetype(urb->pipe), pipetypes[xfertype]);
> >  
> >  	/* Check against a simple/standard policy */
> 
> It seems this change would just be papering over these driver bugs. The
> dev_WARN() is there in the first place to allow us to catch them.
> 
> Even if it takes some work, it should be doable to track down and add
> the missing sanity checks to the drivers that lack them. Some have
> already been fixed, and I have some more pending patches to fix or add
> helpers to simplify fixing the remaining ones.

Ah, fine.  I misunderstood what the warning message was about.

regards,
dan carpenter