Re: [Patch] Off by one in drivers/usb/input/yealink.c

[Eric Sesterhenn / Snakebyte <snakebyte@gmx.de>]

* Randy.Dunlap (rdunlap@xenotime.net) wrote:
> On Wed, 28 Jun 2006 00:41:19 +0200 Eric Sesterhenn wrote:
> 
> > hi,
> > 
> > another off by one spotted by coverity (id #485),
> > we loop exactly one time too often
> > 
> > Signed-off-by: Eric Sesterhenn <snakebyte@gmx.de>
> > 
> > --- linux-2.6.17-git11/drivers/usb/input/yealink.c.orig	2006-06-28 00:29:46.000000000 +0200
> > +++ linux-2.6.17-git11/drivers/usb/input/yealink.c	2006-06-28 00:30:04.000000000 +0200
> > @@ -350,7 +350,7 @@ static int yealink_do_idle_tasks(struct 
> >  		val = yld->master.b[ix];
> >  		if (val != yld->copy.b[ix])
> >  			goto send_update;
> > -	} while (++ix < sizeof(yld->master));
> > +	} while (++ix < sizeof(yld->master)-1);
> >  
> >  	/* nothing todo, wait a bit and poll for a KEYPRESS */
> >  	yld->stat_ix = 0;
> 
> FWIW, on this one and the previous floppy.c patch,
> I would rather see the comparison be <= instead of using -1.

maybe it is too late, but wouldnt the <= make the loop
run even more iterations, like (++ix < sizeof() + 1)

greetings, Eric