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| author | Zheng Wang <zyytlz.wz@163.com> | 2023-03-13 19:31:20 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-05-11 17:03:14 +0300 |
| commit | 2cdc8f729d953143b3bbdc56841bb6800752de7f (patch) | |
| tree | e2a36b421afa4a0a68f81a2ba046265cc1486183 /drivers/staging | |
| parent | 231a6947ff8460f3353a12f4aa7a962304410da4 (diff) | |
| download | linux-2cdc8f729d953143b3bbdc56841bb6800752de7f.tar.xz | |
media: cedrus: fix use after free bug in cedrus_remove due to race condition
[ Upstream commit 50d0a7aea4809cef87979d4669911276aa23b71f ]
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
an 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.
Fixes: 7c38a551bda1 ("media: cedrus: Add watchdog for job completion")
Signed-off-by: Zheng Wang <zyytlz.wz@163.com>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/staging')
| -rw-r--r-- | drivers/staging/media/sunxi/cedrus/cedrus.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/staging/media/sunxi/cedrus/cedrus.c b/drivers/staging/media/sunxi/cedrus/cedrus.c index 55c54dfdc585..d2419319afd7 100644 --- a/drivers/staging/media/sunxi/cedrus/cedrus.c +++ b/drivers/staging/media/sunxi/cedrus/cedrus.c @@ -541,6 +541,7 @@ static int cedrus_remove(struct platform_device *pdev) { struct cedrus_dev *dev = platform_get_drvdata(pdev); + cancel_delayed_work_sync(&dev->watchdog_work); if (media_devnode_is_registered(dev->mdev.devnode)) { media_device_unregister(&dev->mdev); v4l2_m2m_unregister_media_controller(dev->m2m_dev); |