Re: [PATCH 1/9 v3] staging: dt3155: check put_user() return value

Simon Horman
2010-08-02T13:51:42Z

On Mon, Aug 02, 2010 at 04:56:38PM +0400, Vasiliy Kulikov wrote:
> put_user() returns code was not checked for errors. To simplify the code
> fill local struct dt3155_read with data and copy it with single
> copy_to_user() call.
>
> Signed-off-by: Kulikov Vasiliy <segooon@gmail.com>

Looks good to me.

Reviewed-by: Simon Horman <horms@verge.net.au>

> ---
> drivers/staging/dt3155/dt3155_drv.c | 13 ++++++-------
> 1 files changed, 6 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/staging/dt3155/dt3155_drv.c b/drivers/staging/dt3155/dt3155_drv.c
> index 7316996..6031837 100644
> --- a/drivers/staging/dt3155/dt3155_drv.c
> +++ b/drivers/staging/dt3155/dt3155_drv.c
> @@ -745,6 +745,7 @@ static ssize_t dt3155_read(struct file *filep, char __user *buf,
> struct dt3155_status *dts = &dt3155_status[minor];
> struct dt3155_fbuffer *fb = &dts->fbuffer;
> struct frame_info *frame_info;
> + struct dt3155_read dt_read;
>
> /* TODO: this should check the error flag and */
> /* return an error on hardware failures */
> @@ -797,14 +798,12 @@ static ssize_t dt3155_read(struct file *filep, char __user *buf,
>
> /* make this an offset */
> offset = frame_info->addr - dts->mem_addr;
> + dt_read.offset = offset;
> + dt_read.frame_seq = fb->frame_count;
> + dt_read.state = dts->state;
> + memcpy(&dt_read.frame_info, frame_info, sizeof(struct frame_info));
>
> - put_user(offset, (unsigned int __user *)buf);
> - buf += sizeof(u32);
> - put_user(fb->frame_count, (unsigned int __user *)buf);
> - buf += sizeof(u32);
> - put_user(dts->state, (unsigned int __user *)buf);
> - buf += sizeof(u32);
> - if (copy_to_user(buf, frame_info, sizeof(*frame_info)))
> + if (copy_to_user(buf, &dt_read, sizeof(struct dt3155_read)))
> return -EFAULT;
>
> return sizeof(struct dt3155_read);
> --
> 1.7.0.4