linux-kernel - Re: [PATCH 1/3] ser_gigaset: fix up NULL checks

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Date:	Wed, 9 Dec 2015 12:12:35 +0000
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Tilman Schmidt <tilman@...p.cc>
Cc:	Paul Bolle <pebolle@...cali.nl>, netdev@...r.kernel.org,
	Peter Hurley <peter@...leysoftware.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	syzkaller@...glegroups.com, David Miller <davem@...emloft.net>,
	Karsten Keil <isdn@...ux-pingi.de>,
	isdn4linux@...tserv.isdn4linux.de,
	gigaset307x-common@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] ser_gigaset: fix up NULL checks

On Wed, 9 Dec 2015 11:45:57 +0100
Tilman Schmidt <tilman@...p.cc> wrote:

> Am 08.12.2015 um 23:16 schrieb One Thousand Gnomes:
> > The right fix as far as I can see is to remove the tests although
> > WARN_ON() combined with your tty->ops change might be safer.
> 
> Feel free to submit a patch.

Will do later today. Want a patch on top of Paul's change or a single
patch including both and crediting him ?

> > tty locking reviews, but drivers/isdn and net/irda weren't traditionally
> > part of the general tty maintenance but handled separately/
> 
> Or just ignored.

Unfortunately at the time that seemed to happen a lot.

> >> test puzzle me. It's not obvious why they're needed. Ie, can the null
> >> dereferences they try to catch really happen? But I can try to figure
> >> out that in the future, if I ever feel the urge to do so. Anyhow:
> >>
> >> Acked-by: Paul Bolle <pebolle@...cali.nl>
> > 
> > Nacked-by: Alan Cox <alan@...ux.intel.com>
> 
> So you feel it's better to maintain the current inconsistent state
> created by commit f34d7a5b? Please elaborate.

No I'd rather we didn't make it look magically better then forget about
the mess in question.

Alan
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