linux-kernel - Re: [PATCH] mfd: Fix potential NULL pointer dereference

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Message-ID: <20170717122120.uxevckop5mgzttid@dell>
Date:   Mon, 17 Jul 2017 13:21:20 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] mfd: Fix potential NULL pointer dereference

On Wed, 05 Jul 2017, Christophe JAILLET wrote:

> if 'max8998_i2c_parse_dt_pdata() fails (when out of memory), a NULL
> pointer dereference will occur in the error handling code.
> 
> Return directly instead.
> 
> Fixes: ee999fb3f17f("mfd: max8998: Add support for Device Tree")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
>  drivers/mfd/max8998.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)

Applied, thanks.

> diff --git a/drivers/mfd/max8998.c b/drivers/mfd/max8998.c
> index 4c33b8063bc3..b1d3f70782d9 100644
> --- a/drivers/mfd/max8998.c
> +++ b/drivers/mfd/max8998.c
> @@ -192,10 +192,8 @@ static int max8998_i2c_probe(struct i2c_client *i2c,
>  
>  	if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) {
>  		pdata = max8998_i2c_parse_dt_pdata(&i2c->dev);
> -		if (IS_ERR(pdata)) {
> -			ret = PTR_ERR(pdata);
> -			goto err;
> -		}
> +		if (IS_ERR(pdata))
> +			return PTR_ERR(pdata);
>  	}
>  
>  	i2c_set_clientdata(i2c, max8998);

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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