linux-kernel - Re: [PATCH 150/190] Revert "media: gspca: mt9m111: Check write

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Date:   Tue, 27 Apr 2021 15:22:41 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Aditya Pakki <pakki001@....edu>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Subject: Re: [PATCH 150/190] Revert "media: gspca: mt9m111: Check
 write_bridge for timeout"

On Wed, Apr 21, 2021 at 03:00:25PM +0200, Greg Kroah-Hartman wrote:
> This reverts commit 656025850074f5c1ba2e05be37bda57ba2b8d491.
> 
> 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: Aditya Pakki <pakki001@....edu>
> Cc: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  drivers/media/usb/gspca/m5602/m5602_mt9m111.c | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/media/usb/gspca/m5602/m5602_mt9m111.c b/drivers/media/usb/gspca/m5602/m5602_mt9m111.c
> index bfa3b381d8a2..50481dc928d0 100644
> --- a/drivers/media/usb/gspca/m5602/m5602_mt9m111.c
> +++ b/drivers/media/usb/gspca/m5602/m5602_mt9m111.c
> @@ -195,7 +195,7 @@ static const struct v4l2_ctrl_config mt9m111_greenbal_cfg = {
>  int mt9m111_probe(struct sd *sd)
>  {
>  	u8 data[2] = {0x00, 0x00};
> -	int i, rc = 0;
> +	int i;
>  	struct gspca_dev *gspca_dev = (struct gspca_dev *)sd;
>  
>  	if (force_sensor) {
> @@ -213,18 +213,16 @@ int mt9m111_probe(struct sd *sd)
>  	/* Do the preinit */
>  	for (i = 0; i < ARRAY_SIZE(preinit_mt9m111); i++) {
>  		if (preinit_mt9m111[i][0] == BRIDGE) {
> -			rc |= m5602_write_bridge(sd,
> +			m5602_write_bridge(sd,
>  				preinit_mt9m111[i][1],
>  				preinit_mt9m111[i][2]);
>  		} else {
>  			data[0] = preinit_mt9m111[i][2];
>  			data[1] = preinit_mt9m111[i][3];
> -			rc |= m5602_write_sensor(sd,
> +			m5602_write_sensor(sd,
>  				preinit_mt9m111[i][1], data, 2);
>  		}
>  	}
> -	if (rc < 0)
> -		return rc;
>  
>  	if (m5602_read_sensor(sd, MT9M111_SC_CHIPVER, data, 2))
>  		return -ENODEV;
> -- 
> 2.31.1
> 

Same here, OR error values together is not ok, keeping this revert.

greg k-h