linux-kernel - Re: [PATCH v2 3/5] staging: vchiq: Move vchiq char driver to its own file

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Date:   Mon, 21 Jun 2021 12:56:31 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Ojaswin Mujoo <ojaswin98@...il.com>
Cc:     nsaenz@...nel.org, gregkh@...uxfoundation.org,
        stefan.wahren@...e.com, arnd@...db.de, phil@...pberrypi.com,
        bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/5] staging: vchiq: Move vchiq char driver to its own
 file

On Sun, Jun 20, 2021 at 06:26:34PM +0530, Ojaswin Mujoo wrote:
> +/* read a user pointer value from an array pointers in user space */
> +static inline int vchiq_get_user_ptr(void __user **buf, void __user *ubuf, int index)
> +{
> +	int ret;
> +
> +	if (in_compat_syscall()) {
> +		compat_uptr_t ptr32;
> +
   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
When I'm reviewing these sorts of patches then what I'm trying to verify
is that you are not a UMN "researcher" trying to change the code without
anyone noticing.  In the orignal code, there was no blank line here

> +		compat_uptr_t __user *uptr = ubuf;

but there was a blank line here.

> +		ret = get_user(ptr32, uptr + index);
> +		*buf = compat_ptr(ptr32);
> +	} else {

These sorts of minor white space changes make it hard to verify the code
in an automated way.

> +		uintptr_t ptr, __user *uptr = ubuf;
> +
> +		ret = get_user(ptr, uptr + index);
> +		*buf = (void __user *)ptr;
> +	}
> +
> +	return ret;
> +}
> +

regards,
dan carpenter