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Subject: media: rc: do not access device via sysfs after rc_unregister_device() Author: Sean Young sean@mess.org Date: Sat Aug 8 13:38:02 2020 +0200

Device drivers do not expect to have change_protocol or wakeup re-programming to be accesed after rc_unregister_device(). This can cause the device driver to access deallocated resources.

Cc: stable@vger.kernel.org # 4.16+ Signed-off-by: Sean Young sean@mess.org Signed-off-by: Mauro Carvalho Chehab mchehab+huawei@kernel.org

drivers/media/rc/rc-main.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)

---

diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c index e1cda80a4b25..dee8a9f3d80a 100644 --- a/drivers/media/rc/rc-main.c +++ b/drivers/media/rc/rc-main.c @@ -1292,6 +1292,10 @@ static ssize_t store_protocols(struct device *device, }

mutex_lock(&dev->lock); + if (!dev->registered) { + mutex_unlock(&dev->lock); + return -ENODEV; + }

old_protocols = *current_protocols; new_protocols = old_protocols; @@ -1430,6 +1434,10 @@ static ssize_t store_filter(struct device *device, return -EINVAL;

mutex_lock(&dev->lock); + if (!dev->registered) { + mutex_unlock(&dev->lock); + return -ENODEV; + }

new_filter = *filter; if (fattr->mask) @@ -1544,6 +1552,10 @@ static ssize_t store_wakeup_protocols(struct device *device, int i;

mutex_lock(&dev->lock); + if (!dev->registered) { + mutex_unlock(&dev->lock); + return -ENODEV; + }

allowed = dev->allowed_wakeup_protocols;