FAILED: patch "[PATCH] media: tuner: xc5000: Fix use-after-free in xc5000_release

FAILED: patch "[PATCH] media: tuner: xc5000: Fix use-after-free in xc5000_release

[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 40b7a19f321e65789612ebaca966472055dab48c
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2025100341-dime-left-e15f@gregkh' --subject-prefix 'PATCH 5.4.y' HEAD^..

Possible dependencies:



thanks,

greg k-h

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

From 40b7a19f321e65789612ebaca966472055dab48c Mon Sep 17 00:00:00 2001
From: Duoming Zhou <duoming@zju.edu.cn>
Date: Wed, 17 Sep 2025 17:56:08 +0800
Subject: [PATCH] media: tuner: xc5000: Fix use-after-free in xc5000_release

The original code uses cancel_delayed_work() in xc5000_release(), which
does not guarantee that the delayed work item timer_sleep has fully
completed if it was already running. This leads to use-after-free scenarios
where xc5000_release() may free the xc5000_priv while timer_sleep is still
active and attempts to dereference the xc5000_priv.

A typical race condition is illustrated below:

CPU 0 (release thread)                 | CPU 1 (delayed work callback)
xc5000_release()                       | xc5000_do_timer_sleep()
  cancel_delayed_work()                |
  hybrid_tuner_release_state(priv)     |
    kfree(priv)                        |
                                       |   priv = container_of() // UAF

Replace cancel_delayed_work() with cancel_delayed_work_sync() to ensure
that the timer_sleep is properly canceled before the xc5000_priv memory
is deallocated.

A deadlock concern was considered: xc5000_release() is called in a process
context and is not holding any locks that the timer_sleep work item might
also need. Therefore, the use of the _sync() variant is safe here.

This bug was initially identified through static analysis.

Fixes: f7a27ff1fb77 ("[media] xc5000: delay tuner sleep to 5 seconds")
Cc: stable@vger.kernel.org
Signed-off-by: Duoming Zhou <duoming@zju.edu.cn>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
[hverkuil: fix typo in Subject: tunner -> tuner]

diff --git a/drivers/media/tuners/xc5000.c b/drivers/media/tuners/xc5000.c
index bf4ff461e082..a28481edd22e 100644
--- a/drivers/media/tuners/xc5000.c
+++ b/drivers/media/tuners/xc5000.c
@@ -1304,7 +1304,7 @@ static void xc5000_release(struct dvb_frontend *fe)
 	mutex_lock(&xc5000_list_mutex);
 
 	if (priv) {
-		cancel_delayed_work(&priv->timer_sleep);
+		cancel_delayed_work_sync(&priv->timer_sleep);
 		hybrid_tuner_release_state(priv);
 	}
 

[PATCH 5.4.y 1/2] media: tunner: xc5000: Refactor firmware load

[Sasha Levin]

From: Ricardo Ribalda <ribalda@chromium.org>

[ Upstream commit 8e1f5da59dd4a1966f859639860b803a7e8b8bfb ]

Make sure the firmware is released when we leave
xc_load_fw_and_init_tuner()

This change makes smatch happy:
drivers/media/tuners/xc5000.c:1213 xc_load_fw_and_init_tuner() warn: 'fw' from request_firmware() not released on lines: 1213.

Cc: Shuah Khan <shuah.kh@samsung.com>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Stable-dep-of: 40b7a19f321e ("media: tuner: xc5000: Fix use-after-free in xc5000_release")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/media/tuners/xc5000.c | 39 +++++++++++++++--------------------
 1 file changed, 17 insertions(+), 22 deletions(-)

diff --git a/drivers/media/tuners/xc5000.c b/drivers/media/tuners/xc5000.c
index 65b8863385575..8b939ab84ee77 100644
--- a/drivers/media/tuners/xc5000.c
+++ b/drivers/media/tuners/xc5000.c
@@ -58,7 +58,7 @@ struct xc5000_priv {
 	struct dvb_frontend *fe;
 	struct delayed_work timer_sleep;
 
-	const struct firmware   *firmware;
+	bool inited;
 };
 
 /* Misc Defines */
@@ -1110,23 +1110,19 @@ static int xc_load_fw_and_init_tuner(struct dvb_frontend *fe, int force)
 	if (!force && xc5000_is_firmware_loaded(fe) == 0)
 		return 0;
 
-	if (!priv->firmware) {
-		ret = request_firmware(&fw, desired_fw->name,
-					priv->i2c_props.adap->dev.parent);
-		if (ret) {
-			pr_err("xc5000: Upload failed. rc %d\n", ret);
-			return ret;
-		}
-		dprintk(1, "firmware read %zu bytes.\n", fw->size);
+	ret = request_firmware(&fw, desired_fw->name,
+			       priv->i2c_props.adap->dev.parent);
+	if (ret) {
+		pr_err("xc5000: Upload failed. rc %d\n", ret);
+		return ret;
+	}
+	dprintk(1, "firmware read %zu bytes.\n", fw->size);
 
-		if (fw->size != desired_fw->size) {
-			pr_err("xc5000: Firmware file with incorrect size\n");
-			release_firmware(fw);
-			return -EINVAL;
-		}
-		priv->firmware = fw;
-	} else
-		fw = priv->firmware;
+	if (fw->size != desired_fw->size) {
+		pr_err("xc5000: Firmware file with incorrect size\n");
+		release_firmware(fw);
+		return -EINVAL;
+	}
 
 	/* Try up to 5 times to load firmware */
 	for (i = 0; i < 5; i++) {
@@ -1204,6 +1200,7 @@ static int xc_load_fw_and_init_tuner(struct dvb_frontend *fe, int force)
 	}
 
 err:
+	release_firmware(fw);
 	if (!ret)
 		printk(KERN_INFO "xc5000: Firmware %s loaded and running.\n",
 		       desired_fw->name);
@@ -1274,7 +1271,7 @@ static int xc5000_resume(struct dvb_frontend *fe)
 
 	/* suspended before firmware is loaded.
 	   Avoid firmware load in resume path. */
-	if (!priv->firmware)
+	if (!priv->inited)
 		return 0;
 
 	return xc5000_set_params(fe);
@@ -1293,6 +1290,8 @@ static int xc5000_init(struct dvb_frontend *fe)
 	if (debug)
 		xc_debug_dump(priv);
 
+	priv->inited = true;
+
 	return 0;
 }
 
@@ -1306,10 +1305,6 @@ static void xc5000_release(struct dvb_frontend *fe)
 
 	if (priv) {
 		cancel_delayed_work(&priv->timer_sleep);
-		if (priv->firmware) {
-			release_firmware(priv->firmware);
-			priv->firmware = NULL;
-		}
 		hybrid_tuner_release_state(priv);
 	}
 
-- 
2.51.0

[PATCH 5.4.y 2/2] media: tuner: xc5000: Fix use-after-free in xc5000_release

[Sasha Levin]

From: Duoming Zhou <duoming@zju.edu.cn>

[ Upstream commit 40b7a19f321e65789612ebaca966472055dab48c ]

The original code uses cancel_delayed_work() in xc5000_release(), which
does not guarantee that the delayed work item timer_sleep has fully
completed if it was already running. This leads to use-after-free scenarios
where xc5000_release() may free the xc5000_priv while timer_sleep is still
active and attempts to dereference the xc5000_priv.

A typical race condition is illustrated below:

CPU 0 (release thread)                 | CPU 1 (delayed work callback)
xc5000_release()                       | xc5000_do_timer_sleep()
  cancel_delayed_work()                |
  hybrid_tuner_release_state(priv)     |
    kfree(priv)                        |
                                       |   priv = container_of() // UAF

Replace cancel_delayed_work() with cancel_delayed_work_sync() to ensure
that the timer_sleep is properly canceled before the xc5000_priv memory
is deallocated.

A deadlock concern was considered: xc5000_release() is called in a process
context and is not holding any locks that the timer_sleep work item might
also need. Therefore, the use of the _sync() variant is safe here.

This bug was initially identified through static analysis.

Fixes: f7a27ff1fb77 ("[media] xc5000: delay tuner sleep to 5 seconds")
Cc: stable@vger.kernel.org
Signed-off-by: Duoming Zhou <duoming@zju.edu.cn>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
[hverkuil: fix typo in Subject: tunner -> tuner]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/media/tuners/xc5000.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/tuners/xc5000.c b/drivers/media/tuners/xc5000.c
index 8b939ab84ee77..ea4f1ae4d686e 100644
--- a/drivers/media/tuners/xc5000.c
+++ b/drivers/media/tuners/xc5000.c
@@ -1304,7 +1304,7 @@ static void xc5000_release(struct dvb_frontend *fe)
 	mutex_lock(&xc5000_list_mutex);
 
 	if (priv) {
-		cancel_delayed_work(&priv->timer_sleep);
+		cancel_delayed_work_sync(&priv->timer_sleep);
 		hybrid_tuner_release_state(priv);
 	}
 
-- 
2.51.0