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: v4.9.255~1
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b9c3223bb198adbb05e14587160f6e31cf80d307;p=thirdparty%2Fkernel%2Fstable.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 0afae9f73ebb4..f326a6ea35fc7 100644
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -887,6 +887,7 @@ 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;
 	}