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@xxxxxxxxxxxxxxx> # 4.16
Signed-off-by: Sean Young <sean@xxxxxxxx>
---
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;
--
2.26.2
