linux-kernel - Re: [PATCH 21/24] staging/iio/adc: fix dangling pointers

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Date:	Mon, 22 Mar 2010 12:41:12 +0000
From:	Jonathan Cameron <kernel@...23.retrosnub.co.uk>
To:	Wolfram Sang <w.sang@...gutronix.de>
CC:	kernel-janitors@...r.kernel.org, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org, Greg Kroah-Hartman <gregkh@...e.de>,
	devel@...verdev.osuosl.org
Subject: Re: [PATCH 21/24] staging/iio/adc: fix dangling pointers

On 03/20/10 14:13, Wolfram Sang wrote:
> Fix I2C-drivers which missed setting clientdata to NULL before freeing the
> structure it points to. Also fix drivers which do this _after_ the structure
> was freed already.
> 
> Signed-off-by: Wolfram Sang <w.sang@...gutronix.de>
> Cc: Greg Kroah-Hartman <gregkh@...e.de>
Acked-by: Jonathan Cameron <jic23@....ac.uk>

Thanks,
> ---
> 
> Found using coccinelle, then reviewed. Full patchset is available via
> kernel-janitors, linux-i2c, and LKML.
> ---
>  drivers/staging/iio/adc/max1363_core.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/staging/iio/adc/max1363_core.c b/drivers/staging/iio/adc/max1363_core.c
> index 9703881..1682fd0 100644
> --- a/drivers/staging/iio/adc/max1363_core.c
> +++ b/drivers/staging/iio/adc/max1363_core.c
> @@ -556,6 +556,7 @@ error_put_reg:
>  	if (!IS_ERR(st->reg))
>  		regulator_put(st->reg);
>  error_free_st:
> +	i2c_set_clientdata(client, NULL);
>  	kfree(st);
>  
>  error_ret:
> @@ -573,6 +574,7 @@ static int max1363_remove(struct i2c_client *client)
>  		regulator_disable(st->reg);
>  		regulator_put(st->reg);
>  	}
> +	i2c_set_clientdata(client, NULL);
>  	kfree(st);
>  
>  	return 0;

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