Re: [patch] Input: ff-core - silence an underflow warning

[Dan Carpenter <dan.carpenter@oracle.com>]

On Mon, Sep 28, 2015 at 05:28:30PM -0700, Dmitry Torokhov wrote:
> On Tue, Sep 22, 2015 at 04:26:43PM +0300, Dan Carpenter wrote:
> > My static checker complains that "value" comes from the user in
> > evdev_do_ioctl() and we check that it's not too large here but we don't
> > check that it's negative.  It's harmless because the ->set_gain() and
> > ->set_autocenter() functions truncate it to a valid u16 value, but we
> > may as well fix it just to make the static checker happy.
> > 
> > Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> > 
> > diff --git a/drivers/input/ff-core.c b/drivers/input/ff-core.c
> > index c642082..6a94c5f 100644
> > --- a/drivers/input/ff-core.c
> > +++ b/drivers/input/ff-core.c
> > @@ -273,14 +273,14 @@ int input_ff_event(struct input_dev *dev, unsigned int type,
> >  
> >  	switch (code) {
> >  	case FF_GAIN:
> > -		if (!test_bit(FF_GAIN, dev->ffbit) || value > 0xffff)
> > +		if (!test_bit(FF_GAIN, dev->ffbit) || value > 0xffffUL)
> >  			break;
> >  
> >  		ff->set_gain(dev, value);
> >  		break;
> >  
> >  	case FF_AUTOCENTER:
> > -		if (!test_bit(FF_AUTOCENTER, dev->ffbit) || value > 0xffff)
> > +		if (!test_bit(FF_AUTOCENTER, dev->ffbit) || value > 0xffffUL)
> 
> Why UL and not U?
> 

You're right.  That could just be U.  I'll resend.

regards,
dan carpenter