linux-kernel - Re: [PATCH] staging: line6: fix possible overrun

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Date:	Tue, 29 Apr 2014 16:47:11 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Mateusz Guzik <mguzik@...hat.com>, gregkh@...uxfoundation.org,
	devel@...verdev.osuosl.org,
	Laurent Navet <laurent.navet@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: line6: fix possible overrun

At Mon, 28 Apr 2014 01:44:25 +0300,
Dan Carpenter wrote:
> 
> On Sun, Apr 27, 2014 at 10:00:43PM +0200, Mateusz Guzik wrote:
> > > >  and a WARN_ON + -EINVAL in line6_init_audio to catch future
> > > >  offenders.
> > > 
> > > Returning -EINVAL is a bad idea because it would break the driver
> > > completely and make it unusable.
> > > 
> > 
> > Well I would vote for returning the error anyway.
> 
> I'm trying to be polite, but you are talking about adding regressions
> deliberately...
> 
> It's very rare for people to deliberately add regressions to the kernel.
> I have only seen it one time before.

I don't think Dan would be against returning -EINVAL if all the
offender codes have been fixed (e.g. truncating strings to fit with
the fixed arrays) at first.  Then it'd be a good help to catch any
future bugs.  But, having -EINVAL without fixing the caller side means
essentially that you're introducing the breakage intentionally
although you know it certainly breaks, which is obviously bad.


Takashi
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