media: rc: do not access device via sysfs after rc_unregister_device()

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: <stable@vger.kernel.org> # 4.16+
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c
index 6f80c251f64136a78e2f5565555ce04f925bd81f..70df83835b5cdd0ff3614791b653d97ce36ec30b 100644 (file)
--- a/drivers/media/rc/rc-main.c
+++ b/drivers/media/rc/rc-main.c
@@ -1256,6 +1256,10 @@ 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;
@@ -1394,6 +1398,10 @@ 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)
@@ -1508,6 +1516,10 @@ 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;