linux-kernel - Re: __user with scalar data types

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Date:   Tue, 20 Jun 2017 09:42:01 +0200
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     Daniel Vetter <daniel@...ll.ch>, Al Viro <viro@...iv.linux.org.uk>,
        "Clark, Rob" <robdclark@...il.com>
Cc:     linux-sparse@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: __user with scalar data types

  Hi,

> Yep that's cargo-culted, but from a quick grep only msm and qxl
> headers do this (the other __user annotations in uapi/drm are for
> pointers, where it's correct). Adding those maintainers.

Yep, those looks pointless indeed.

> Also, if you use u64_to_user_ptr helper macro sparse should have
> caught this (if not we'd need to improve the macro).

And qxl should actually use it.

Fix attached (compile-tested only so far), does that look ok?

cheers,
  Gerd
View attachment "qxlfix" of type "text/x-patch" (2828 bytes)