[PATCH 5.15 131/371] media: rkvdec: fix use after free bug in rkvdec_remove

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From: Zheng Wang <zyytlz.wz@xxxxxxx>

[ Upstream commit 3228cec23b8b29215e18090c6ba635840190993d ]

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@xxxxxxx>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/staging/media/rkvdec/rkvdec.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c
index 4fd4a2907da70..bc4683a75e61f 100644
--- a/drivers/staging/media/rkvdec/rkvdec.c
+++ b/drivers/staging/media/rkvdec/rkvdec.c
@@ -1042,6 +1042,8 @@ 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);
-- 
2.39.2






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