FAILED: patch "[PATCH] media: platform: mtk-mdp3: fix NULL deref on failed SCP" failed to apply to 6.6-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 6.6-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 <stable@vger.kernel.org>.

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-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x 90368323fb244da0504e3da37a182f8e89bcc3b9
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026090902-childlike-retreat-8753@gregkh' --subject-prefix 'PATCH 6.6.y' 'HEAD^..'

Possible dependencies:



thanks,

greg k-h

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

From 90368323fb244da0504e3da37a182f8e89bcc3b9 Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@kernel.org>
Date: Mon, 6 Jul 2026 08:59:27 +0200
Subject: [PATCH] media: platform: mtk-mdp3: fix NULL deref on failed SCP
 lookup

Add the missing sanity check after looking up the SCP to avoid
dereferencing a NULL-pointer in case its driver has not yet been bound.

Fixes: 61890ccaefaf ("media: platform: mtk-mdp3: add MediaTek MDP3 driver")
Cc: stable@vger.kernel.org	# 6.1
Cc: Moudy Ho <moudy.ho@mediatek.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>

diff --git a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c
index 121b1006ffdc..f412aadb5996 100644
--- a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c
+++ b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c
@@ -296,6 +296,11 @@ static int mdp_probe(struct platform_device *pdev)
 		mdp->scp = platform_get_drvdata(mm_pdev);
 	}
 
+	if (!mdp->scp) {
+		ret = -EPROBE_DEFER;
+		goto err_destroy_clock_wq;
+	}
+
 	mdp->rproc_handle = scp_get_rproc(mdp->scp);
 	dev_dbg(&pdev->dev, "MDP rproc_handle: %p", mdp->rproc_handle);