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Subject: media: rc: ensure that uevent can be read directly after rc device register Author: Sean Young sean@mess.org Date: Sun Dec 20 13:29:54 2020 +0100
There is a race condition where if the /sys/class/rc0/uevent file is read before rc_dev->registered is set to true, -ENODEV will be returned.
Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1901089
Cc: stable@vger.kernel.org Fixes: a2e2d73fa281 ("media: rc: do not access device via sysfs after rc_unregister_device()") Signed-off-by: Sean Young sean@mess.org Signed-off-by: Mauro Carvalho Chehab mchehab+huawei@kernel.org
drivers/media/rc/rc-main.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c index 1d811e5ffb55..29d4d01896ff 100644 --- a/drivers/media/rc/rc-main.c +++ b/drivers/media/rc/rc-main.c @@ -1928,6 +1928,8 @@ int rc_register_device(struct rc_dev *dev) goto out_raw; }
+ dev->registered = true; + rc = device_add(&dev->dev); if (rc) goto out_rx_free; @@ -1937,8 +1939,6 @@ int rc_register_device(struct rc_dev *dev) dev->device_name ?: "Unspecified device", path ?: "N/A"); kfree(path);
- dev->registered = true; - /* * once the the input device is registered in rc_setup_rx_device, * userspace can open the input device and rc_open() will be called