[PATCH 4.4 28/28] NFC: fix possible resource leak

[Greg Kroah-Hartman]

From: Pan Bian <bianpan2016@xxxxxxx>

commit d8f923c3ab96dbbb4e3c22d1afc1dc1d3b195cd8 upstream.

Put the device to avoid resource leak on path that the polling flag is
invalid.

Fixes: a831b9132065 ("NFC: Do not return EBUSY when stopping a poll that's already stopped")
Signed-off-by: Pan Bian <bianpan2016@xxxxxxx>
Link: https://lore.kernel.org/r/20210121153745.122184-1-bianpan2016@xxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 net/nfc/netlink.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -850,6 +850,7 @@ static int nfc_genl_stop_poll(struct sk_
 
 	if (!dev->polling) {
 		device_unlock(&dev->dev);
+		nfc_put_device(dev);
 		return -EINVAL;
 	}