From: Pan Bian <bianpan2016@163.com>
Date: Thu, 21 Jan 2021 15:37:45 +0000 (-0800)
Subject: NFC: fix possible resource leak
X-Git-Tag: v4.14.219~3
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=f7f55a40b65bfc2f15bc695ad9f93b996ccc8ea3;p=users%2Fdwmw2%2Flinux.git

NFC: fix possible resource leak

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@163.com>
Link: https://lore.kernel.org/r/20210121153745.122184-1-bianpan2016@163.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c
index 2d642baeafbb2..18957fbf37ff7 100644
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -884,6 +884,7 @@ static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
 
 	if (!dev->polling) {
 		device_unlock(&dev->dev);
+		nfc_put_device(dev);
 		return -EINVAL;
 	}