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Message-ID: <20210406134246.2145396-1-yangyingliang@huawei.com> Date: Tue, 6 Apr 2021 21:42:46 +0800 From: Yang Yingliang <yangyingliang@...wei.com> To: <linux-kernel@...r.kernel.org>, <linux-media@...r.kernel.org> CC: <mchehab@...nel.org>, <hverkuil-cisco@...all.nl> Subject: [PATCH -next] media: adv7604: fix possible use-after-free in adv76xx_remove() 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@...wei.com> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com> --- drivers/media/i2c/adv7604.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/i2c/adv7604.c b/drivers/media/i2c/adv7604.c index 18184297e2f0..9cf6de66ae25 100644 --- a/drivers/media/i2c/adv7604.c +++ b/drivers/media/i2c/adv7604.c @@ -3618,7 +3618,7 @@ static int adv76xx_remove(struct i2c_client *client) io_write(sd, 0x6e, 0); io_write(sd, 0x73, 0); - cancel_delayed_work(&state->delayed_work_enable_hotplug); + cancel_delayed_work_sync(&state->delayed_work_enable_hotplug); v4l2_async_unregister_subdev(sd); media_entity_cleanup(&sd->entity); adv76xx_unregister_clients(to_state(sd)); -- 2.25.1
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