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authorYang Yingliang <yangyingliang@huawei.com>2021-04-06 21:39:29 +0800
committerHans Verkuil <hverkuil-cisco@xs4all.nl>2021-04-07 16:05:53 +0200
commitadddc06aaadbc6a12f8055cc8c7891a52b282690 (patch)
tree6a853ebb668ce6b8679e3f0b93597d2392c8a76e
parentc1c1d437b1f0a84de6b53416026f7ea1ef3df996 (diff)
media: tc358743: fix possible use-after-free in tc358743_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@huawei.com> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
-rw-r--r--drivers/media/i2c/tc358743.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/media/i2c/tc358743.c b/drivers/media/i2c/tc358743.c
index 831b5b54fd78..1b309bb743c7 100644
--- a/drivers/media/i2c/tc358743.c
+++ b/drivers/media/i2c/tc358743.c
@@ -2193,7 +2193,7 @@ static int tc358743_remove(struct i2c_client *client)
del_timer_sync(&state->timer);
flush_work(&state->work_i2c_poll);
}
- cancel_delayed_work(&state->delayed_work_enable_hotplug);
+ cancel_delayed_work_sync(&state->delayed_work_enable_hotplug);
cec_unregister_adapter(state->cec_adap);
v4l2_async_unregister_subdev(sd);
v4l2_device_unregister_subdev(sd);

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