This is a note to let you know that I've just added the patch titled
drm/i915: Fix NULL ptr deref by checking new_crtc_state
to the 6.1-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-i915-fix-null-ptr-deref-by-checking-new_crtc_sta.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit f19596cdea982189f481c43ad807f409c82c56c3
Author: Stanislav Lisovskiy <stanislav.lisovskiy@xxxxxxxxx>
Date: Fri May 5 11:22:12 2023 +0300
drm/i915: Fix NULL ptr deref by checking new_crtc_state
[ Upstream commit a41d985902c153c31c616fe183cf2ee331e95ecb ]
intel_atomic_get_new_crtc_state can return NULL, unless crtc state wasn't
obtained previously with intel_atomic_get_crtc_state, so we must check it
for NULLness here, just as in many other places, where we can't guarantee
that intel_atomic_get_crtc_state was called.
We are currently getting NULL ptr deref because of that, so this fix was
confirmed to help.
Fixes: 74a75dc90869 ("drm/i915/display: move plane prepare/cleanup to intel_atomic_plane.c")
Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@xxxxxxxxx>
Reviewed-by: Andrzej Hajda <andrzej.hajda@xxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20230505082212.27089-1-stanislav.lisovskiy@xxxxxxxxx
(cherry picked from commit 1d5b09f8daf859247a1ea65b0d732a24d88980d8)
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/i915/display/intel_atomic_plane.c b/drivers/gpu/drm/i915/display/intel_atomic_plane.c
index aaa6708256d58..82826454b5e83 100644
--- a/drivers/gpu/drm/i915/display/intel_atomic_plane.c
+++ b/drivers/gpu/drm/i915/display/intel_atomic_plane.c
@@ -988,7 +988,7 @@ intel_prepare_plane_fb(struct drm_plane *_plane,
int ret;
if (old_obj) {
- const struct intel_crtc_state *crtc_state =
+ const struct intel_crtc_state *new_crtc_state =
intel_atomic_get_new_crtc_state(state,
to_intel_crtc(old_plane_state->hw.crtc));
@@ -1003,7 +1003,7 @@ intel_prepare_plane_fb(struct drm_plane *_plane,
* This should only fail upon a hung GPU, in which case we
* can safely continue.
*/
- if (intel_crtc_needs_modeset(crtc_state)) {
+ if (new_crtc_state && intel_crtc_needs_modeset(new_crtc_state)) {
ret = i915_sw_fence_await_reservation(&state->commit_ready,
old_obj->base.resv, NULL,
false, 0,
