Re: [PATCH net] tun: handle copy failure in tun_put_user()

[David Miller]

From: Jason Wang <jasowang@xxxxxxxxxx>
Date: Mon, 20 Jan 2014 11:16:48 +0800

> This patch return the error code of copy helpers in tun_put_user() instead of
> ignoring them.
> 
> Cc: Michael S. Tsirkin <mst@xxxxxxxxxx>
> Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>

If you perform some of the copy successfully, you have to report that
length rather than just an error.

Otherwise userland has no way to determine how much of the data was
successfully sourced.

I'm not applying this, sorry.
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