From: Zheng Wang <zyytlz.wz@163.com>
To: mchehab@kernel.org
Cc: wens@csie.org, jernej.skrabec@gmail.com, samuel@sholland.org,
linux-media@vger.kernel.org, linux-staging@lists.linux.dev,
linux-arm-kernel@lists.infradead.org,
linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org,
hackerzheng666@gmail.com, 1395428693sheep@gmail.com,
alex000young@gmail.com, Zheng Wang <zyytlz.wz@163.com>
Subject: [PATCH] media: cedrus: fix use after free bug in cedrus_remove due to race condition
Date: Wed, 8 Mar 2023 11:23:33 +0800 [thread overview]
Message-ID: <20230308032333.1893394-1-zyytlz.wz@163.com> (raw)
In cedrus_probe, dev->watchdog_work is bound with cedrus_watchdog function.
In cedrus_device_run, it will started by schedule_delayed_work. If there is
unfinished work in cedrus_remove, there may be a race condition and trigger
UAF bug.
CPU0 CPU1
|cedrus_watchdog
cedrus_remove |
v4l2_m2m_release |
kfree(m2m_dev) |
|
| v4l2_m2m_get_curr_priv
| m2m_dev //use
Fix it by canceling the worker in cedrus_remove.
Signed-off-by: Zheng Wang <zyytlz.wz@163.com>
---
drivers/staging/media/sunxi/cedrus/cedrus.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/staging/media/sunxi/cedrus/cedrus.c b/drivers/staging/media/sunxi/cedrus/cedrus.c
index a43d5ff66716..c95d011c0817 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus.c
@@ -546,7 +546,7 @@ static int cedrus_probe(struct platform_device *pdev)
static int cedrus_remove(struct platform_device *pdev)
{
struct cedrus_dev *dev = platform_get_drvdata(pdev);
-
+ cancel_delayed_work(&dev->watchdog_work);
if (media_devnode_is_registered(dev->mdev.devnode)) {
media_device_unregister(&dev->mdev);
v4l2_m2m_unregister_media_controller(dev->m2m_dev);
--
2.25.1
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next reply other threads:[~2023-03-08 3:24 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-08 3:23 Zheng Wang [this message]
-- strict thread matches above, loose matches on Subject: below --
2023-09-15 11:40 [PATCH] media: cedrus: fix use after free bug in cedrus_remove due to race condition Ma Ke
2023-09-15 12:33 ` Dan Carpenter
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