linux-kernel - Re: [PATCH 2/3] block: sed-opal: ioctl for writing to shadow mbr

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Message-ID: <20190501134833.GB24132@infradead.org>
Date:   Wed, 1 May 2019 06:48:33 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     David Kozub <zub@...ux.fjfi.cvut.cz>
Cc:     Jens Axboe <axboe@...nel.dk>,
        Jonathan Derrick <jonathan.derrick@...el.com>,
        Scott Bauer <sbauer@...donthack.me>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jonas Rabenstein <jonas.rabenstein@...dium.uni-erlangen.de>
Subject: Re: [PATCH 2/3] block: sed-opal: ioctl for writing to shadow mbr

> +	if (!access_ok((void __user *)(uintptr_t)info->data, info->size))
> +		return -EFAULT;

Just let the copy_from_user itself return the error itself.