From: Sean Young <s...@mess.org> commit a2e2d73fa28136598e84db9d021091f1b98cbb1a upstream.
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: <sta...@vger.kernel.org> # 4.16+ Signed-off-by: Sean Young <s...@mess.org> Signed-off-by: Mauro Carvalho Chehab <mchehab+hua...@kernel.org> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- drivers/media/rc/rc-main.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) --- a/drivers/media/rc/rc-main.c +++ b/drivers/media/rc/rc-main.c @@ -1256,6 +1256,10 @@ static ssize_t store_protocols(struct de } mutex_lock(&dev->lock); + if (!dev->registered) { + mutex_unlock(&dev->lock); + return -ENODEV; + } old_protocols = *current_protocols; new_protocols = old_protocols; @@ -1394,6 +1398,10 @@ static ssize_t store_filter(struct devic return -EINVAL; mutex_lock(&dev->lock); + if (!dev->registered) { + mutex_unlock(&dev->lock); + return -ENODEV; + } new_filter = *filter; if (fattr->mask) @@ -1508,6 +1516,10 @@ static ssize_t store_wakeup_protocols(st int i; mutex_lock(&dev->lock); + if (!dev->registered) { + mutex_unlock(&dev->lock); + return -ENODEV; + } allowed = dev->allowed_wakeup_protocols;