linux-kernel - Re: [PATCH] staging: android: binder.c: avoid sparse checker warning: cast removes address space of expression

Open Source and information security mailing list archives

Date:	Thu, 17 Apr 2014 02:58:10 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Yves Deweerdt <yves.deweerdt.linux@...il.com>
Cc:	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Serban Constantinescu <serban.constantinescu@....com>,
	Arve Hjønnevåg <arve@...roid.com>,
	John Stultz <john.stultz@...aro.org>,
	Bojan Prtvar <prtvar.b@...il.com>, mathieu.maret@...il.com
Subject: Re: [PATCH] staging: android: binder.c: avoid sparse checker
 warning: cast removes address space of expression

On Wed, Apr 16, 2014 at 10:42:17PM +0200, Yves Deweerdt wrote:
> 
> __user should be kept when casting to struct binder_version *
> 
> 

Mathieu sent this one earlier.
http://driverdev.linuxdriverproject.org/pipermail/driverdev-devel/2014-April/048614.html

His is perfect, except that he missed the space in the ": {", but it's
still ok.

regards,
dan carpenter

> Signed-off-by: Yves Deweerdt <yves.deweerdt.linux@...il.com>
> ---
>  drivers/staging/android/binder.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/android/binder.c b/drivers/staging/android/binder.c
> index cfe4bc8..0f74e43 100644
> --- a/drivers/staging/android/binder.c
> +++ b/drivers/staging/android/binder.c
> @@ -2683,16 +2683,21 @@ static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
>  		binder_free_thread(proc, thread);
>  		thread = NULL;
>  		break;
> -	case BINDER_VERSION:
> +	case BINDER_VERSION: {
> +		struct binder_version __user *bv =
> +			(struct binder_version __user *)ubuf;
> +
>  		if (size != sizeof(struct binder_version)) {
>  			ret = -EINVAL;
>  			goto err;
>  		}
> -		if (put_user(BINDER_CURRENT_PROTOCOL_VERSION, &((struct binder_version *)ubuf)->protocol_version)) {
> +		if (put_user(BINDER_CURRENT_PROTOCOL_VERSION,
> +				&(bv->protocol_version))) {
>  			ret = -EINVAL;
>  			goto err;
>  		}
>  		break;
> +	}
>  	default:
>  		ret = -EINVAL;
>  		goto err;
> -- 
> 1.8.3.2
> 
> _______________________________________________
> devel mailing list
> devel@...uxdriverproject.org
> http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
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