linux-kernel - Re: [PATCH 093/190] Revert "iio: hmc5843: fix potential NULL pointer dereferences"

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Date:   Thu, 22 Apr 2021 09:26:25 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     <linux-kernel@...r.kernel.org>, Kangjie Lu <kjlu@....edu>
Subject: Re: [PATCH 093/190] Revert "iio: hmc5843: fix potential NULL
 pointer dereferences"

On Wed, 21 Apr 2021 14:59:28 +0200
Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:

> This reverts commit 536cc27deade8f1ec3c1beefa60d5fbe0f6fcb28.
> 
> Commits from @umn.edu addresses have been found to be submitted in "bad
> faith" to try to test the kernel community's ability to review "known
> malicious" changes.  The result of these submissions can be found in a
> paper published at the 42nd IEEE Symposium on Security and Privacy
> entitled, "Open Source Insecurity: Stealthily Introducing
> Vulnerabilities via Hypocrite Commits" written by Qiushi Wu (University
> of Minnesota) and Kangjie Lu (University of Minnesota).
> 
> Because of this, all submissions from this group must be reverted from
> the kernel tree and will need to be re-reviewed again to determine if
> they actually are a valid fix.  Until that work is complete, remove this
> change to ensure that no problems are being introduced into the
> codebase.
> 
> Cc: Kangjie Lu <kjlu@....edu>
> Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Hi Greg,

Checked this one.  As far as I can tell it was a valid cleanup of
error handling. Far from critical though and unlikely to be seen in practice.

So either leave it in place, or we can bring it back later. I don't mind
which.

> ---
>  drivers/iio/magnetometer/hmc5843_i2c.c | 7 +------
>  drivers/iio/magnetometer/hmc5843_spi.c | 7 +------
>  2 files changed, 2 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/iio/magnetometer/hmc5843_i2c.c b/drivers/iio/magnetometer/hmc5843_i2c.c
> index 67fe657fdb3e..9a4491233d08 100644
> --- a/drivers/iio/magnetometer/hmc5843_i2c.c
> +++ b/drivers/iio/magnetometer/hmc5843_i2c.c
> @@ -55,13 +55,8 @@ static const struct regmap_config hmc5843_i2c_regmap_config = {
>  static int hmc5843_i2c_probe(struct i2c_client *cli,
>  			     const struct i2c_device_id *id)
>  {
> -	struct regmap *regmap = devm_regmap_init_i2c(cli,
> -			&hmc5843_i2c_regmap_config);
> -	if (IS_ERR(regmap))
> -		return PTR_ERR(regmap);
> -
>  	return hmc5843_common_probe(&cli->dev,
> -			regmap,
> +			devm_regmap_init_i2c(cli, &hmc5843_i2c_regmap_config),
>  			id->driver_data, id->name);
>  }
>  
> diff --git a/drivers/iio/magnetometer/hmc5843_spi.c b/drivers/iio/magnetometer/hmc5843_spi.c
> index d827554c346e..58bdbc7257ec 100644
> --- a/drivers/iio/magnetometer/hmc5843_spi.c
> +++ b/drivers/iio/magnetometer/hmc5843_spi.c
> @@ -55,7 +55,6 @@ static const struct regmap_config hmc5843_spi_regmap_config = {
>  static int hmc5843_spi_probe(struct spi_device *spi)
>  {
>  	int ret;
> -	struct regmap *regmap;
>  	const struct spi_device_id *id = spi_get_device_id(spi);
>  
>  	spi->mode = SPI_MODE_3;
> @@ -65,12 +64,8 @@ static int hmc5843_spi_probe(struct spi_device *spi)
>  	if (ret)
>  		return ret;
>  
> -	regmap = devm_regmap_init_spi(spi, &hmc5843_spi_regmap_config);
> -	if (IS_ERR(regmap))
> -		return PTR_ERR(regmap);
> -
>  	return hmc5843_common_probe(&spi->dev,
> -			regmap,
> +			devm_regmap_init_spi(spi, &hmc5843_spi_regmap_config),
>  			id->driver_data, id->name);
>  }
>