linux-kernel - Re: [PATCH v2] drm: return -EFAULT if copy_to

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Date:   Wed, 26 Jun 2019 00:18:54 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Sean Paul <sean@...rly.run>
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH v2] drm: return -EFAULT if copy_to_user() fails

On Tue, Jun 18, 2019 at 01:16:29PM -0400, Sean Paul wrote:
> On Tue, Jun 18, 2019 at 04:18:43PM +0300, Dan Carpenter wrote:
> > The copy_from_user() function returns the number of bytes remaining
> > to be copied but we want to return a negative error code.  Otherwise
> > the callers treat it as a successful copy.
> > 
> > Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> 
> Thanks Dan, I've applied this to drm-misc-fixes.

FWIW, Acked-by: Al Viro <viro@...iv.linux.org.uk>