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media: i2c: tda1997: Fix possible use-after-free in tda1997x_remove()

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[ Upstream commit 7f820ab5d4 ]

This driver's remove path calls cancel_delayed_work(). However, that
function does not wait until the work function finishes. This means
that the callback function may still be running after the driver's
remove function has finished, which would result in a use-after-free.

Fix by calling cancel_delayed_work_sync(), which ensures that
the work is properly cancelled, no longer running, and unable
to re-schedule itself.

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yang Yingliang
2021-04-06 15:49:45 +02:00
committed by Greg Kroah-Hartman
parent 3f9e0eb062
commit c8e7e6e178
1 changed files with 1 additions and 1 deletions
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2
drivers/media/i2c/tda1997x.c
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@@ -2804,7 +2804,7 @@ static int tda1997x_remove(struct i2c_client *client)
media_entity_cleanup(&sd->entity);
v4l2_ctrl_handler_free(&state->hdl);
regulator_bulk_disable(TDA1997X_NUM_SUPPLIES, state->supplies);
cancel_delayed_work(&state->delayed_work_enable_hpd);
cancel_delayed_work_sync(&state->delayed_work_enable_hpd);
mutex_destroy(&state->page_lock);
mutex_destroy(&state->lock);