mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-21 14:37:57 +00:00
58 lines
2.4 KiB
Diff
58 lines
2.4 KiB
Diff
From 0e81807e647c5e12fd897f3d520252ea60de3ff9 Mon Sep 17 00:00:00 2001
|
|
From: Boris Brezillon <boris.brezillon@bootlin.com>
|
|
Date: Thu, 15 Nov 2018 11:58:51 +0100
|
|
Subject: [PATCH 761/806] drm/vc4: Fix NULL pointer dereference in the async
|
|
update path
|
|
|
|
vc4_plane_atomic_async_update() calls vc4_plane_atomic_check()
|
|
which in turn calls vc4_plane_setup_clipping_and_scaling(), and since
|
|
commit 58a6a36fe8e0 ("drm/vc4: Use
|
|
drm_atomic_helper_check_plane_state() to simplify the logic"), this
|
|
function accesses plane_state->state which will be NULL when called
|
|
from the async update path because we're passing the current plane
|
|
state, and plane_state->state has been assigned to NULL in
|
|
drm_atomic_helper_swap_state().
|
|
|
|
Pass the new state instead of the current one (the new state has
|
|
->state set to a non-NULL value).
|
|
|
|
Fixes: 58a6a36fe8e0 ("drm/vc4: Use drm_atomic_helper_check_plane_state() to simplify the logic")
|
|
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
|
|
Reviewed-by: Eric Anholt <eric@anholt.net>
|
|
Link: https://patchwork.freedesktop.org/patch/msgid/20181115105852.9844-1-boris.brezillon@bootlin.com
|
|
---
|
|
drivers/gpu/drm/vc4/vc4_plane.c | 15 +++++++++++++--
|
|
1 file changed, 13 insertions(+), 2 deletions(-)
|
|
|
|
--- a/drivers/gpu/drm/vc4/vc4_plane.c
|
|
+++ b/drivers/gpu/drm/vc4/vc4_plane.c
|
|
@@ -905,7 +905,7 @@ void vc4_plane_async_set_fb(struct drm_p
|
|
static void vc4_plane_atomic_async_update(struct drm_plane *plane,
|
|
struct drm_plane_state *state)
|
|
{
|
|
- struct vc4_plane_state *vc4_state = to_vc4_plane_state(plane->state);
|
|
+ struct vc4_plane_state *vc4_state, *new_vc4_state;
|
|
|
|
if (plane->state->fb != state->fb) {
|
|
vc4_plane_async_set_fb(plane, state->fb);
|
|
@@ -927,7 +927,18 @@ static void vc4_plane_atomic_async_updat
|
|
plane->state->src_y = state->src_y;
|
|
|
|
/* Update the display list based on the new crtc_x/y. */
|
|
- vc4_plane_atomic_check(plane, plane->state);
|
|
+ vc4_plane_atomic_check(plane, state);
|
|
+
|
|
+ new_vc4_state = to_vc4_plane_state(state);
|
|
+ vc4_state = to_vc4_plane_state(plane->state);
|
|
+
|
|
+ /* Update the current vc4_state pos0, pos2 and ptr0 dlist entries. */
|
|
+ vc4_state->dlist[vc4_state->pos0_offset] =
|
|
+ new_vc4_state->dlist[vc4_state->pos0_offset];
|
|
+ vc4_state->dlist[vc4_state->pos2_offset] =
|
|
+ new_vc4_state->dlist[vc4_state->pos2_offset];
|
|
+ vc4_state->dlist[vc4_state->ptr0_offset] =
|
|
+ new_vc4_state->dlist[vc4_state->ptr0_offset];
|
|
|
|
/* Note that we can't just call vc4_plane_write_dlist()
|
|
* because that would smash the context data that the HVS is
|