From e73aca5184ad9fc948ba22b4d35dce11db35bb25 Mon Sep 17 00:00:00 2001 From: Liu Ying Date: Tue, 18 Oct 2016 16:44:03 +0800 Subject: [PATCH] drm/imx: ipuv3-plane: Access old u/vbo properly in ->atomic_check for YU12/YV12 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") Cc: stable@vger.kernel.org # 4.8 Signed-off-by: Liu Ying Signed-off-by: Philipp Zabel --- drivers/gpu/drm/imx/ipuv3-plane.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/imx/ipuv3-plane.c b/drivers/gpu/drm/imx/ipuv3-plane.c index cfb34b595d15..5c342997863e 100644 --- a/drivers/gpu/drm/imx/ipuv3-plane.c +++ b/drivers/gpu/drm/imx/ipuv3-plane.c @@ -355,7 +355,9 @@ static int ipu_plane_atomic_check(struct drm_plane *plane, 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)