linux-kernel - Re: gigaset: freeing an active object

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Date:	Mon, 30 Nov 2015 19:30:15 +0100
From:	Tilman Schmidt <tilman@...p.cc>
To:	Paul Bolle <pebolle@...cali.nl>,
	Peter Hurley <peter@...leysoftware.com>,
	Sasha Levin <sasha.levin@...cle.com>
Cc:	isdn@...ux-pingi.de, davem@...emloft.net,
	gigaset307x-common@...ts.sourceforge.net,
	LKML <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	syzkaller <syzkaller@...glegroups.com>
Subject: Re: gigaset: freeing an active object

Am 30.11.2015 um 19:01 schrieb Paul Bolle:
> [DRAFT] gigaset: don't free() a struct platform_device
> 
> One is not supposed to free() a struct platform_device. Instead one
> should, in the common case, only call platform_device_unregister(). That
> will drop the platform device's reference count. (Actually it's the
> reference count of the embedded kobject that is important here. But for
> users of platform devices that's basically irrelevant.)
> 
> So move struct platform_device dev out of struct ser_cardstate, because
> ser_cardstate is (malloc'ed and) free'd.

I wonder how that will behave if someone attaches two of the devices to
different serial ports. Not likely, but not forbidden either.

Regards,
Tilman

-- 
Tilman Schmidt                              E-Mail: tilman@...p.cc
Bonn, Germany
Nous, on a des fleurs et des bougies pour nous protéger.


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