linux-kernel - [PATCH 4.19 09/79] ip6_gre: fix a dst leak in ip6erspan_tunnel

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Date:   Fri, 20 Sep 2019 00:02:54 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Xin Long <lucien.xin@...il.com>,
        William Tu <u9012063@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.19 09/79] ip6_gre: fix a dst leak in ip6erspan_tunnel_xmit

From: Xin Long <lucien.xin@...il.com>

[ Upstream commit 28e486037747c2180470b77c290d4090ad42f259 ]

In ip6erspan_tunnel_xmit(), if the skb will not be sent out, it has to
be freed on the tx_err path. Otherwise when deleting a netns, it would
cause dst/dev to leak, and dmesg shows:

  unregister_netdevice: waiting for lo to become free. Usage count = 1

Fixes: ef7baf5e083c ("ip6_gre: add ip6 erspan collect_md mode")
Signed-off-by: Xin Long <lucien.xin@...il.com>
Acked-by: William Tu <u9012063@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv6/ip6_gre.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -988,7 +988,7 @@ static netdev_tx_t ip6erspan_tunnel_xmit
 		if (unlikely(!tun_info ||
 			     !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
 			     ip_tunnel_info_af(tun_info) != AF_INET6))
-			return -EINVAL;
+			goto tx_err;
 
 		key = &tun_info->key;
 		memset(&fl6, 0, sizeof(fl6));