drm: Check for lessee in DROP_MASTER ioctl
Don't let a lessee control what the current DRM master is set to; that's the job of the "real" master. Otherwise, the lessee would disable all access to master operations for the owner and all lessees under it. This matches the same check made in the SET_MASTER ioctl. Signed-off-by:Keith Packard <keithp@keithp.com> Fixes: 2ed077e4 ("drm: Add drm_object lease infrastructure [v5]") Cc: <stable@vger.kernel.org> # v4.15+ Signed-off-by:
Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20180119015159.1606-1-keithp@keithp.com
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