From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alexander Potapenko , Daniel Vetter , Chris Wilson , Dave Airlie Subject: [PATCH 4.4 160/192] drm: Reject page_flip for !DRIVER_MODESET Date: Mon, 12 Sep 2016 19:01:09 +0200 Message-Id: <20160912152205.776390087@linuxfoundation.org> In-Reply-To: <20160912152158.855601725@linuxfoundation.org> References: <20160912152158.855601725@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Daniel Vetter commit 6f00975c619064a18c23fd3aced325ae165a73b9 upstream. 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: Alexander Potapenko Cc: Alexander Potapenko Signed-off-by: Daniel Vetter Reviewed-by: Chris Wilson Signed-off-by: Dave Airlie Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/drm_crtc.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/gpu/drm/drm_crtc.c +++ b/drivers/gpu/drm/drm_crtc.c @@ -5231,6 +5231,9 @@ int drm_mode_page_flip_ioctl(struct drm_ 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;