linux-kernel - Re: [PATCH] power: gpio-charger: fix potential NULL dereference

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Message-ID: <4CE6C9A4.4090307@metafoo.de>
Date:	Fri, 19 Nov 2010 20:01:56 +0100
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Vasiliy Kulikov <segoon@...nwall.com>
CC:	kernel-janitors@...r.kernel.org,
	Anton Vorontsov <cbouatmailru@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] power: gpio-charger: fix potential NULL dereference

Vasiliy Kulikov wrote:
> kzalloc() result is not compared with NULL.  It might lead to NULL
> pointer dereference in OOM situation.
> 
> Signed-off-by: Vasiliy Kulikov <segoon@...nwall.com>
> ---
>  Compile tested only.
> 
>  drivers/power/gpio-charger.c |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/power/gpio-charger.c b/drivers/power/gpio-charger.c
> index fccbe99..b07a71c 100644
> --- a/drivers/power/gpio-charger.c
> +++ b/drivers/power/gpio-charger.c
> @@ -87,6 +87,10 @@ static int __devinit gpio_charger_probe(struct platform_device *pdev)
>  	}
>  
>  	gpio_charger = kzalloc(sizeof(*gpio_charger), GFP_KERNEL);
> +	if (!gpio_charger) {
> +		dev_err(&pdev->dev, "kzalloc failed\n");
> +		return -ENOMEM;
> +	}
>  
>  	charger = &gpio_charger->charger;
>  

Hi

I already send a similar patch yesterday.
See http://lkml.org/lkml/2010/11/18/632

- Lars
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