linux-kernel - Re: [PATCH] staging/dt3155: make copy_{to/from}_user and put

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Date:	Thu, 11 Mar 2010 11:01:10 +1100
From:	Simon Horman <horms@...ge.net.au>
To:	H Hartley Sweeten <hartleys@...ionengravers.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>, greg@...ah.com,
	ss@....gov.au
Subject: Re: [PATCH] staging/dt3155: make copy_{to/from}_user and put_user
 typesafe

On Thu, Mar 04, 2010 at 10:20:18AM -0700, H Hartley Sweeten wrote:
> This makes the kernel to user space data transfers typesafe and removes
> a number of unnecessary (void *) casts.

Could you be more specific about what you mean by typesafe?
There still seem to be casts in there. Although fewer than before :-)

> Signed-off-by: H Hartley Sweeten <hsweeten@...ionengravers.com>
> Cc: Greg Kroah-Hartman <greg@...ah.com>
> Cc: Scott Smedley <ss@....gov.au>
> 
> ---
> 
> diff --git a/drivers/staging/dt3155/dt3155_drv.c b/drivers/staging/dt3155/dt3155_drv.c
> index a67c622..76c9d94 100644
> --- a/drivers/staging/dt3155/dt3155_drv.c
> +++ b/drivers/staging/dt3155/dt3155_drv.c
> @@ -528,6 +528,7 @@ static int dt3155_ioctl(struct inode *inode,
>  			unsigned long arg)
>  {
>    int minor = MINOR(inode->i_rdev); /* What device are we ioctl()'ing? */
> +  void __user *up = (void __user *)arg;
>  
>    if ( minor >= MAXBOARDS || minor < 0 )
>      return -ENODEV;
> @@ -554,7 +555,7 @@ static int dt3155_ioctl(struct inode *inode,
>  
>  	{
>  	  struct dt3155_config_s tmp;
> -	  if (copy_from_user((void *)&tmp, (void *) arg, sizeof(tmp)))
> +	  if (copy_from_user(&tmp, up, sizeof(tmp)))
>  	      return -EFAULT;
>  	  /* check for valid settings */
>  	  if (tmp.rows > DT3155_MAX_ROWS ||
> @@ -572,8 +573,7 @@ static int dt3155_ioctl(struct inode *inode,
>        }
>      case DT3155_GET_CONFIG:
>        {
> -	if (copy_to_user((void *) arg, (void *) &dt3155_status[minor],
> -		     sizeof(dt3155_status_t) ))
> +	if (copy_to_user(up, &dt3155_status[minor], sizeof(dt3155_status_t)))
>  	    return -EFAULT;
>  	return 0;
>        }
> @@ -593,8 +593,7 @@ static int dt3155_ioctl(struct inode *inode,
>  	  return 0;
>  
>  	quick_stop(minor);
> -	if (copy_to_user((void *) arg, (void *) &dt3155_status[minor],
> -		     sizeof(dt3155_status_t)))
> +	if (copy_to_user(up, &dt3155_status[minor], sizeof(dt3155_status_t)))
>  	    return -EFAULT;
>  	return 0;
>        }
> @@ -617,8 +616,7 @@ static int dt3155_ioctl(struct inode *inode,
>  	  }
>  
>  	dt3155_init_isr(minor);
> -	if (copy_to_user( (void *) arg, (void *) &dt3155_status[minor],
> -		      sizeof(dt3155_status_t)))
> +	if (copy_to_user(up, &dt3155_status[minor], sizeof(dt3155_status_t)))
>  	    return -EFAULT;
>  	return 0;
>        }
> @@ -819,11 +817,11 @@ static ssize_t dt3155_read(struct file *filep, char __user *buf,
>    /* make this an offset */
>    offset = frame_info_p->addr - dt3155_status[minor].mem_addr;
>  
> -  put_user(offset, (unsigned int *) buf);
> +  put_user(offset, (unsigned int __user *)buf);
>    buf += sizeof(u32);
> -  put_user( dt3155_status[minor].fbuffer.frame_count, (unsigned int *) buf);
> +  put_user( dt3155_status[minor].fbuffer.frame_count, (unsigned int __user *)buf);
>    buf += sizeof(u32);
> -  put_user(dt3155_status[minor].state, (unsigned int *) buf);
> +  put_user(dt3155_status[minor].state, (unsigned int __user *)buf);
>    buf += sizeof(u32);
>    if (copy_to_user(buf, frame_info_p, sizeof(frame_info_t)))
>        return -EFAULT;
> --
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