Patch "drm/imx: ipuv3-plane: Access old u/vbo properly in ->atomic_check for YU12/YV12" has been added to the 4.8-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    drm/imx: ipuv3-plane: Access old u/vbo properly in ->atomic_check for YU12/YV12

to the 4.8-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-imx-ipuv3-plane-access-old-u-vbo-properly-in-atomic_check-for-yu12-yv12.patch
and it can be found in the queue-4.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From e73aca5184ad9fc948ba22b4d35dce11db35bb25 Mon Sep 17 00:00:00 2001
From: Liu Ying <gnuiyl@gmail.com>
Date: Tue, 18 Oct 2016 16:44:03 +0800
Subject: drm/imx: ipuv3-plane: Access old u/vbo properly in ->atomic_check for YU12/YV12

From: Liu Ying <gnuiyl@gmail.com>

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 <gnuiyl@gmail.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 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)


Patches currently in stable-queue which might be from gnuiyl@gmail.com are

queue-4.8/drm-imx-ipuv3-plane-access-old-u-vbo-properly-in-atomic_check-for-yu12-yv12.patch
queue-4.8/drm-imx-ipuv3-plane-switch-eba-buffer-only-when-we-don-t-need-modeset.patch