Commit 6c000a45 authored by Daniel Vetter's avatar Daniel Vetter Committed by Sasha Levin

drm: Reject page_flip for !DRIVER_MODESET

[ Upstream commit 6f00975c ]

Somehow this one slipped through, which means drivers without modeset
support can be oopsed (since those also don't call
drm_mode_config_init, which means the crtc lookup will chase an
uninitalized idr).
Reported-by: default avatarAlexander Potapenko <glider@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@intel.com>
Reviewed-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
parent f4eaf28c
......@@ -4923,6 +4923,9 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
unsigned long flags;
int ret = -EINVAL;
if (!drm_core_check_feature(dev, DRIVER_MODESET))
return -EINVAL;
if (page_flip->flags & ~DRM_MODE_PAGE_FLIP_FLAGS ||
page_flip->reserved != 0)
return -EINVAL;
......
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