linux-kernel - Re: [PATCH] hvsi: Messed up error checking getting state name

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Date:	Fri, 16 Apr 2010 15:18:08 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Phil Carmody <ext-phil.2.carmody@...ia.com>
Cc:	benh@...nel.crashing.org, roel.kluin@...il.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hvsi: Messed up error checking getting state name

On Fri, 16 Apr 2010 14:49:14 +0300
Phil Carmody <ext-phil.2.carmody@...ia.com> wrote:

> From: Phil Carmody <ext-phil.2.carmody@...ia.com>
> 
> Handle out-of-range indices before reading what they refer
> to.

Well...  That doesn't matter really - as long as we don't dereference it.

> And don't access the one-past-the-end element of the
> array either.
> 

Yup, that's a bug.

> ---
>  drivers/char/hvsi.c |    6 ++----
>  1 files changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/char/hvsi.c b/drivers/char/hvsi.c
> index 793b236..d4b14ff 100644
> --- a/drivers/char/hvsi.c
> +++ b/drivers/char/hvsi.c
> @@ -194,10 +194,8 @@ static inline void print_state(struct hvsi_struct *hp)
>  		"HVSI_WAIT_FOR_MCTRL_RESPONSE",
>  		"HVSI_FSP_DIED",
>  	};
> -	const char *name = state_names[hp->state];
> -
> -	if (hp->state > ARRAY_SIZE(state_names))
> -		name = "UNKNOWN";
> +	const char *name = (hp->state < ARRAY_SIZE(state_names))
> +		? state_names[hp->state] : "UNKNOWN";
>  
>  	pr_debug("hvsi%i: state = %s\n", hp->index, name);
>  #endif /* DEBUG */
> -- 
> 1.6.0.4
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