linux-kernel - Re: [PATCH 3/4] pinctrl: Add checks for empty names in pinmux_search

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Message-ID: <CACRpkdYnC9smbM+WeYxahZGbevFiYyMRbyPKS+Y1YNryH_27iw@mail.gmail.com>
Date:	Thu, 26 Jan 2012 14:14:55 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Tony Lindgren <tony@...mide.com>
Cc:	Stephen Warren <swarren@...dia.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Barry Song <21cnbao@...il.com>,
	Haojian Zhuang <haojian.zhuang@...vell.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Thomas Abraham <thomas.abraham@...aro.org>,
	Rajendra Nayak <rajendra.nayak@...aro.org>,
	Dong Aisheng <dong.aisheng@...aro.org>,
	Shawn Guo <shawn.guo@...escale.com>
Subject: Re: [PATCH 3/4] pinctrl: Add checks for empty names in pinmux_search_function

On Wed, Jan 25, 2012 at 11:08 PM, Tony Lindgren <tony@...mide.com> wrote:

> This is needed as otherwise we can get the following when dealing
> with buggy data in a pinmux driver for pinmux_search_function:
>
> Unable to handle kernel NULL pointer dereference at virtual address 00000000
> ...
> PC is at strcmp+0xc/0x34
> LR is at pinmux_get+0x350/0x8f4
> ...
>
> As we need pctldev initialized to call ops->list_functions, let's
> initialize it before check_ops calls and pass the pctldev to the
> check_ops functions. Do this for both pinmux and pinconf check_ops
> functions.
>
> Signed-off-by: Tony Lindgren <tony@...mide.com>

This looks correct to me, so applied it and pushed to -next
for testing.

Yours,
Linus Walleij
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