FAILED: patch "[PATCH] drm: adv7511: Fix use-after-free in adv7533_attach_dsi()" failed to apply to 5.4-stable tree

FAILED: patch "[PATCH] drm: adv7511: Fix use-after-free in adv7533_attach_dsi()" failed to apply to 5.4-stable tree

[gregkh]

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 <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-5.4.y
git checkout FETCH_HEAD
git cherry-pick -x 81adbd3ff21c1182e06aa02c6be0bfd9ea02d8e8
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2025010606-prude-geiger-28e3@gregkh' --subject-prefix 'PATCH 5.4.y' HEAD^..

Possible dependencies:



thanks,

greg k-h

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

From 81adbd3ff21c1182e06aa02c6be0bfd9ea02d8e8 Mon Sep 17 00:00:00 2001
From: Biju Das <biju.das.jz@bp.renesas.com>
Date: Tue, 19 Nov 2024 19:20:29 +0000
Subject: [PATCH] drm: adv7511: Fix use-after-free in adv7533_attach_dsi()
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The host_node pointer was assigned and freed in adv7533_parse_dt(), and
later, adv7533_attach_dsi() uses the same. Fix this use-after-free issue
by dropping of_node_put() in adv7533_parse_dt() and calling of_node_put()
in error path of probe() and also in the remove().

Fixes: 1e4d58cd7f88 ("drm/bridge: adv7533: Create a MIPI DSI device")
Cc: stable@vger.kernel.org
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241119192040.152657-2-biju.das.jz@bp.renesas.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
index eb5919b38263..a13b3d8ab6ac 100644
--- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
+++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
@@ -1241,8 +1241,10 @@ static int adv7511_probe(struct i2c_client *i2c)
 		return ret;
 
 	ret = adv7511_init_regulators(adv7511);
-	if (ret)
-		return dev_err_probe(dev, ret, "failed to init regulators\n");
+	if (ret) {
+		dev_err_probe(dev, ret, "failed to init regulators\n");
+		goto err_of_node_put;
+	}
 
 	/*
 	 * The power down GPIO is optional. If present, toggle it from active to
@@ -1363,6 +1365,8 @@ static int adv7511_probe(struct i2c_client *i2c)
 	i2c_unregister_device(adv7511->i2c_edid);
 uninit_regulators:
 	adv7511_uninit_regulators(adv7511);
+err_of_node_put:
+	of_node_put(adv7511->host_node);
 
 	return ret;
 }
@@ -1371,6 +1375,8 @@ static void adv7511_remove(struct i2c_client *i2c)
 {
 	struct adv7511 *adv7511 = i2c_get_clientdata(i2c);
 
+	of_node_put(adv7511->host_node);
+
 	adv7511_uninit_regulators(adv7511);
 
 	drm_bridge_remove(&adv7511->bridge);
diff --git a/drivers/gpu/drm/bridge/adv7511/adv7533.c b/drivers/gpu/drm/bridge/adv7511/adv7533.c
index 4481489aaf5e..5f195e91b3e6 100644
--- a/drivers/gpu/drm/bridge/adv7511/adv7533.c
+++ b/drivers/gpu/drm/bridge/adv7511/adv7533.c
@@ -181,8 +181,6 @@ int adv7533_parse_dt(struct device_node *np, struct adv7511 *adv)
 	if (!adv->host_node)
 		return -ENODEV;
 
-	of_node_put(adv->host_node);
-
 	adv->use_timing_gen = !of_property_read_bool(np,
 						"adi,disable-timing-generator");