Dubios pointer casting with put_user()

[Valdis Kl=?utf-8?Q?=c4=93?=tnieks]

On Fri, 17 Jul 2020 02:13:34 +0200, Richard Sailer said:

> unsigned long. Is this (correctness and security wise) sane? Because as
> I understand it put_user() determines the amount it copies from the
> pointer type.

> 		rc = put_user(amount, (int __user *)arg);

If that were true, you wouldn't need to pass the 'amount' variable....
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