linux-kernel - Re: [PATCH] fs: Return -EFAULT if copy_to

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Date:   Mon, 1 Mar 2021 12:52:37 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Wang Qing <wangqing@...o.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fs: Return -EFAULT if copy_to_user() fails

On Mon, Mar 01, 2021 at 07:26:00PM +0800, Wang Qing wrote:
> The copy_to_user() function returns the number of bytes remaining to be
> copied, but we want to return -EFAULT if the copy doesn't complete.

... which is done by the only caller.

        if (set_fd_set(n, inp, fds.res_in) ||
            set_fd_set(n, outp, fds.res_out) ||
            set_fd_set(n, exp, fds.res_ex))
                ret = -EFAULT;