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

From: David Miller
Date: Sun Jan 19 2014 - 22:49:12 EST


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.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/