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

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Message-ID: <20120120174157.GQ22818@atomide.com>
Date:	Fri, 20 Jan 2012 09:41:57 -0800
From:	Tony Lindgren <tony@...mide.com>
To:	Stephen Warren <swarren@...dia.com>
Cc:	"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

* Stephen Warren <swarren@...dia.com> [120120 08:28]:
> Tony Lindgren wrote at Friday, January 20, 2012 9:18 AM:
> > Otherwise we can get the following when dealing with
> > buggy data in a pinmux driver:
> > 
> > Unable to handle kernel NULL pointer dereference at virtual address 00000000
> 
> > diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c
> > index 06b8943..ffe633d 100644
> > --- a/drivers/pinctrl/pinmux.c
> > +++ b/drivers/pinctrl/pinmux.c
> > @@ -584,6 +584,13 @@ static int pinmux_search_function(struct pinctrl_dev *pctldev,
> >  							   selector);
> >  		int ret;
> > 
> > +		if (!fname) {
> > +			pr_warning("no name for function%i\n",
> > +				   selector);
> > +			selector++;
> > +			continue;
> > +		}
> > +
> >  		if (!strcmp(map->function, fname)) {
> >  			/* Found the function, check pin group */
> >  			ret = pinmux_check_pin_group(pctldev, selector,
> 
> Shouldn't this be BUG_ON(!fname)?
>
> There are lots of other places that pmxops->get_function_name() is
> called. Wouldn't it be better to enhance e.g. pinmux_check_ops() to
> validate that all functions have a name during pinctrl registration?

Maybe yeah. I'll take a look next week when I'm back home.

Tony
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