From: Gerd Hoffmann <kraxel@redhat.com>
Date: Wed, 21 Mar 2018 14:08:47 +0000 (+0100)
Subject: drm/i915/gvt: throw error on unhandled vfio ioctls
X-Git-Tag: v4.16.5~18
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a864c3295d0327ba83d491da84858a4ee403d970;p=thirdparty%2Fkernel%2Fstable.git

drm/i915/gvt: throw error on unhandled vfio ioctls

commit 9f591ae60e1be026901398ef99eede91237aa3a1 upstream.

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

Cc: stable@vger.kernel.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index 021f722e24816..f34d7f1e6c4ed 100644
--- 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_device *mdev, unsigned int cmd,
 
 	}
 
-	return 0;
+	return -ENOTTY;
 }
 
 static ssize_t