FAILED: patch "[PATCH] drm/sti: avoid potential dereference of error pointers in" failed to apply to 5.4-stable tree

The patch below does not apply to the 5.4-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.4.y
git checkout FETCH_HEAD
git cherry-pick -x e965e771b069421c233d674c3c8cd8c7f7245f42
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2024120608-overhang-raider-ef25@gregkh' --subject-prefix 'PATCH 5.4.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From e965e771b069421c233d674c3c8cd8c7f7245f42 Mon Sep 17 00:00:00 2001
From: Ma Ke <[email protected]>
Date: Mon, 9 Sep 2024 14:33:59 +0800
Subject: [PATCH] drm/sti: avoid potential dereference of error pointers in
sti_gdp_atomic_check

The return value of drm_atomic_get_crtc_state() needs to be checked. To avoid use of error pointer 'crtc_state' in case of the failure.

index 43c72c2604a0..f046f5f7ad25 100644
@@ -638,6 +638,9 @@ static int sti_gdp_atomic_check(struct drm_plane *drm_plane,
 
 	mixer = to_sti_mixer(crtc);
 	crtc_state = drm_atomic_get_crtc_state(state, crtc);
+	if (IS_ERR(crtc_state))
+		return PTR_ERR(crtc_state);
+
 	mode = &crtc_state->mode;
 	dst_x = new_plane_state->crtc_x;
 	dst_y = new_plane_state->crtc_y;