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| author | Zheng Wang <zyytlz.wz@163.com> | 2023-03-13 19:42:20 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@kernel.org> | 2023-04-10 16:20:25 +0300 |
| commit | 3228cec23b8b29215e18090c6ba635840190993d (patch) | |
| tree | 0054e868a537481042fa5ec28ff066c8c4b2855a /drivers/staging | |
| parent | 50d0a7aea4809cef87979d4669911276aa23b71f (diff) | |
| download | linux-3228cec23b8b29215e18090c6ba635840190993d.tar.xz | |
media: rkvdec: fix use after free bug in rkvdec_remove
In rkvdec_probe, rkvdec->watchdog_work is bound with
rkvdec_watchdog_func. Then rkvdec_vp9_run may
be called to start the work.
If we remove the module which will call rkvdec_remove
to make cleanup, there may be a unfinished work.
The possible sequence is as follows, which will
cause a typical UAF bug.
Fix it by canceling the work before cleanup in rkvdec_remove.
CPU0 CPU1
|rkvdec_watchdog_func
rkvdec_remove |
rkvdec_v4l2_cleanup|
v4l2_m2m_release |
kfree(m2m_dev); |
|
| v4l2_m2m_get_curr_priv
| m2m_dev->curr_ctx //use
Fixes: cd33c830448b ("media: rkvdec: Add the rkvdec driver")
Signed-off-by: Zheng Wang <zyytlz.wz@163.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Diffstat (limited to 'drivers/staging')
| -rw-r--r-- | drivers/staging/media/rkvdec/rkvdec.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c index 7bab7586918c..82806f198074 100644 --- a/drivers/staging/media/rkvdec/rkvdec.c +++ b/drivers/staging/media/rkvdec/rkvdec.c @@ -1066,6 +1066,8 @@ static int rkvdec_remove(struct platform_device *pdev) { struct rkvdec_dev *rkvdec = platform_get_drvdata(pdev); + cancel_delayed_work_sync(&rkvdec->watchdog_work); + rkvdec_v4l2_cleanup(rkvdec); pm_runtime_disable(&pdev->dev); pm_runtime_dont_use_autosuspend(&pdev->dev); |