linux-kernel - Re: [Y2038] [PATCH v2 2/2] ppdev: add support for compat ioctl

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Date:	Wed, 30 Dec 2015 14:51:46 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	y2038@...ts.linaro.org
Cc:	Bamvor Jian Zhang <bamvor.zhangjian@...aro.org>,
	Sudip Mukherjee <sudipm.mukherjee@...il.com>,
	gregkh@...uxfoundation.org, broonie@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [Y2038] [PATCH v2 2/2] ppdev: add support for compat ioctl

On Wednesday 30 December 2015 21:24:21 Bamvor Jian Zhang wrote:
> diff --git a/drivers/char/ppdev.c b/drivers/char/ppdev.c
> index 31bc7b7..9e98d01 100644
> --- a/drivers/char/ppdev.c
> +++ b/drivers/char/ppdev.c
> @@ -636,7 +636,7 @@ static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
>                 if ((time32[0] < 0) || (time32[1] < 0))
>                         return -EINVAL;
>  
> -               if (copy_to_user(time32, argp, sizeof(time32)))
> +               if (copy_to_user(argp, time32, sizeof(time32)))
>                         return -EFAULT;
>  
>                 return 0;
> @@ -648,7 +648,7 @@ static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
>                 if ((time64[0] < 0) || (time64[1] < 0))
>                         return -EINVAL;
>  
> -               if (copy_to_user(time64, argp, sizeof(time64)))
> +               if (copy_to_user(argp, time64, sizeof(time64)))
>                         return -EFAULT;
>  
>                 return 0;

This is something that would be caught by running 'make C=1' with 'sparse'
on your patch. Can you try that to see if you introduce any other warnings?

I'm guessing it's fine, but it would be nice to confirm. I also send a lot
of patches without running sparse and checkpatch first, but it's generally
a good idea.

	Arnd
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