linux-kernel - Re: [PATCH v3 1/4] gpio: brcmstb: fix null ptr dereference in driver remove

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Message-ID: <CACRpkdY_ER-=ig=zeGNKaGFmVrrLrTqXPCJ+75F9eZZ9JOOmxA@mail.gmail.com>
Date:	Mon, 13 Jul 2015 14:24:12 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Gregory Fong <gregory.0xf0@...il.com>
Cc:	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	Alexandre Courbot <gnurou@...il.com>,
	bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
	Brian Norris <computersforpeace@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Florian Fainelli <f.fainelli@...il.com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Russell King <linux@....linux.org.uk>
Subject: Re: [PATCH v3 1/4] gpio: brcmstb: fix null ptr dereference in driver remove

On Thu, Jun 18, 2015 at 3:00 AM, Gregory Fong <gregory.0xf0@...il.com> wrote:

> If a failure occurs during probe, brcmstb_gpio_remove() is called. In
> remove, we call platform_get_drvdata(), but at the time of failure in
> the probe the driver data hadn't yet been set which leads to a NULL
> ptr dereference in the remove's list_for_each.  Call
> platform_set_drvdata() and set up list head right after allocating the
> priv struct to both avoid the null pointer dereference that could
> occur today.  To guard against potential future changes, check for
> null pointer in remove.
>
> Reported-by: Tim Ross <tross@...adcom.com>
> Signed-off-by: Gregory Fong <gregory.0xf0@...il.com>
> ---
> New in v3.

Patch applied.

Yours,
Linus Walleij
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