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, Liu Ying , Philipp Zabel Subject: [PATCH 4.8 105/138] drm/imx: ipuv3-plane: Access old u/vbo properly in ->atomic_check for YU12/YV12 Date: Wed, 9 Nov 2016 11:46:28 +0100 Message-Id: <20161109102849.733941522@linuxfoundation.org> In-Reply-To: <20161109102844.808685475@linuxfoundation.org> References: <20161109102844.808685475@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 4.8-stable review patch. If anyone has any objections, please let me know. ------------------ From: Liu Ying commit e73aca5184ad9fc948ba22b4d35dce11db35bb25 upstream. Before accessing the u/v offset(aka, u/vbo for IPUv3) of the old plane state's relevant fb, we should make sure the fb is in YU12 or YV12 pixel format(which are the two YUV pixel formats we support only), otherwise, we are likely to trigger BUG_ON() in drm_plane_state_to_u/vbo() since the fb's pixel format is probably not YU12 or YV12. Link: https://bugs.freedesktop.org/show_bug.cgi?id=98150 Fixes: c6c1f9bc798b ("drm/imx: Add active plane reconfiguration support") Signed-off-by: Liu Ying Signed-off-by: Philipp Zabel Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/imx/ipuv3-plane.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/drivers/gpu/drm/imx/ipuv3-plane.c +++ b/drivers/gpu/drm/imx/ipuv3-plane.c @@ -360,7 +360,9 @@ static int ipu_plane_atomic_check(struct if ((ubo > 0xfffff8) || (vbo > 0xfffff8)) return -EINVAL; - if (old_fb) { + if (old_fb && + (old_fb->pixel_format == DRM_FORMAT_YUV420 || + old_fb->pixel_format == DRM_FORMAT_YVU420)) { old_ubo = drm_plane_state_to_ubo(old_state); old_vbo = drm_plane_state_to_vbo(old_state); if (ubo != old_ubo || vbo != old_vbo)