linux-kernel - [PATCH 4.16 10/26] drm/i915/gvt: throw error on unhandled vfio ioctls

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Date:   Wed, 25 Apr 2018 12:33:19 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Gerd Hoffmann <kraxel@...hat.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>
Subject: [PATCH 4.16 10/26] drm/i915/gvt: throw error on unhandled vfio ioctls

4.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Gerd Hoffmann <kraxel@...hat.com>

commit 9f591ae60e1be026901398ef99eede91237aa3a1 upstream.

On unknown/unhandled ioctls the driver should return an error, so
userspace knows it tried to use something unsupported.

Cc: stable@...r.kernel.org
Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
Reviewed-by: Alex Williamson <alex.williamson@...hat.com>
Signed-off-by: Zhenyu Wang <zhenyuw@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/i915/gvt/kvmgt.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -1284,7 +1284,7 @@ static long intel_vgpu_ioctl(struct mdev
 
 	}
 
-	return 0;
+	return -ENOTTY;
 }
 
 static ssize_t